Ekadashi is the eleventh tithi of each fortnight and one of the most important fasting days for followers of Lord Vishnu, falling twice in every lunar month - once in the waxing Shukla paksha and once in the waning Krishna paksha. There are two rules for fixing the date, not one, so this calendar lists every upcoming Ekadashi twice: once by the Smarta reckoning and once by the Vaishnava one, each with the Dwadashi parana window in which the fast is broken, computed for your location. No birth details are needed.
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Smarta reckoning: the day whose sunrise falls inside the Ekadashi tithi (suryodaya-vedha only).
Kane, History of Dharmasastra V.i pp.113-115: the Smarta is affected by suryodaya-vedha only, while the Vaishnava is affected by arunodaya-vedha as well - if Dashami persists into the last four ghatikas before sunrise, that Ekadashi is rejected for the Vaishnava and the fast moves to the next day. Garuda and Bhavisya make Ekadashi sampurna only if it also exists two muhurtas (= four ghatikas) before the sunrise of the day it fills.
Dashami had ended before arunodaya opened on 2026-11-05, so both lineages keep the fast on the same day.
Narada Purana purvardha 29.39-40, reported by Kane V.i p.114: "all should accept ekadasi free from dasami."
Kane, History of Dharmasastra V.i p.120 (Kurma Purana): the fast is on Ekadashi and the parana on Dvadashi, in the morning; it must not be deferred to Trayodashi - "that would destroy the merit of twelve dvadasis". Kane allows the 13th in one case only: when no Dvadashi at all exists on the day after the fast.
Hari-Vasara, the first quarter of Dvadashi, ended at 16:35 on 2026-11-05, before sunrise, so it does not delay the parana.
Nirnaya Sindhu I (Ekadashi-nirnaya; Nirnaya Sagara Press 1901, p.35), quoting the Vishnudharma through the Nirnayamrita and the Madanaratna: "द्वादश्याः प्रथमः पादो हरिवासरसंज्ञितः। तमतिक्रम्य कुर्वीत पारणं विष्णुतत्परः॥" - the first quarter of Dvadashi is called Hari-Vasara, and the parana is made after it. Dharmasindhu I (Nirnaya Sagara Press 1888, p.19) gives the rule for a long Dvadashi, and a quarter of Dvadashi can only reach past sunrise when most of the tithi still lies ahead.
Arunodaya (the last 4 ghatikas before sunrise): Kane, History of Dharmasastra V.i pp.113-115: the Smarta is affected by suryodaya-vedha only, while the Vaishnava is affected by arunodaya-vedha as well - if Dashami persists into the last four ghatikas before sunrise, that Ekadashi is rejected for the Vaishnava and the fast moves to the next day. Garuda and Bhavisya make Ekadashi sampurna only if it also exists two muhurtas (= four ghatikas) before the sunrise of the day it fills.
Vaishnava reckoning: suryodaya-vedha plus arunodaya-vedha - an Ekadashi whose Dashami runs into the last four ghatikas before sunrise is rejected.
Kane, History of Dharmasastra V.i pp.113-115: the Smarta is affected by suryodaya-vedha only, while the Vaishnava is affected by arunodaya-vedha as well - if Dashami persists into the last four ghatikas before sunrise, that Ekadashi is rejected for the Vaishnava and the fast moves to the next day. Garuda and Bhavisya make Ekadashi sampurna only if it also exists two muhurtas (= four ghatikas) before the sunrise of the day it fills.
Dashami had ended before arunodaya opened on 2026-11-05, so the Vaishnava fast falls on the same day as the Smarta one.
Kane, History of Dharmasastra V.i p.113: sannyasins and widows follow the Vaishnava reckoning. On a doubled Ekadashi, Narada Purana purvardha 29.45 gives the earlier day to householders and the later to ascetics - a third axis, orthogonal to Smarta/Vaishnava and not emitted as a separate date here.
Kane, History of Dharmasastra V.i p.120 (Kurma Purana): the fast is on Ekadashi and the parana on Dvadashi, in the morning; it must not be deferred to Trayodashi - "that would destroy the merit of twelve dvadasis". Kane allows the 13th in one case only: when no Dvadashi at all exists on the day after the fast.
Hari-Vasara, the first quarter of Dvadashi, ended at 16:35 on 2026-11-05, before sunrise, so it does not delay the parana.
Nirnaya Sindhu I (Ekadashi-nirnaya; Nirnaya Sagara Press 1901, p.35), quoting the Vishnudharma through the Nirnayamrita and the Madanaratna: "द्वादश्याः प्रथमः पादो हरिवासरसंज्ञितः। तमतिक्रम्य कुर्वीत पारणं विष्णुतत्परः॥" - the first quarter of Dvadashi is called Hari-Vasara, and the parana is made after it. Dharmasindhu I (Nirnaya Sagara Press 1888, p.19) gives the rule for a long Dvadashi, and a quarter of Dvadashi can only reach past sunrise when most of the tithi still lies ahead.
Arunodaya (the last 4 ghatikas before sunrise): Kane, History of Dharmasastra V.i pp.113-115: the Smarta is affected by suryodaya-vedha only, while the Vaishnava is affected by arunodaya-vedha as well - if Dashami persists into the last four ghatikas before sunrise, that Ekadashi is rejected for the Vaishnava and the fast moves to the next day. Garuda and Bhavisya make Ekadashi sampurna only if it also exists two muhurtas (= four ghatikas) before the sunrise of the day it fills.
Smarta reckoning, kshaya Ekadashi: no sunrise falls inside the tithi, so the fast is on the day it runs in - the one case the texts allow Smartas a fast on Ekadashi mixed with Dashami.
Kane, History of Dharmasastra V.i pp.114-115: the Smarta is bound by suryodaya-vedha only, and the texts allow a fast on Ekadashi mixed with Dashami to Smartas and never to Vaishnavas; for the Vaishnava, Dashami at sunrise rejects the day and the fast is on the day wholly covered by Dvadashi, with the parana on the next. Nirnayasindhu I (Ekadashi-nirnaya; Khemraj 1913 ed. with the Setu commentary, p.94) confines the take-the-later-day resolution to Vaishnavas (tad vaisnava-visayam), householders taking the earlier day.
This Ekadashi is kshaya: it runs 07:16 on 2026-11-20 to 06:32 on 2026-11-21 and touches no sunrise. Smartas, bound only by suryodaya-vedha, keep the fast on 2026-11-20, the day it runs in, although Dashami holds that day's sunrise.
Kane, History of Dharmasastra V.i pp.114-115: the Smarta is bound by suryodaya-vedha only, and the texts allow a fast on Ekadashi mixed with Dashami to Smartas and never to Vaishnavas; for the Vaishnava, Dashami at sunrise rejects the day and the fast is on the day wholly covered by Dvadashi, with the parana on the next. Nirnayasindhu I (Ekadashi-nirnaya; Khemraj 1913 ed. with the Setu commentary, p.94) confines the take-the-later-day resolution to Vaishnavas (tad vaisnava-visayam), householders taking the earlier day.
The tithi at sunrise on this day is 10 (Shukla); the fast is for the Ekadashi that follows that sunrise the same day.
Kane, History of Dharmasastra V.i p.120 (Kurma Purana): the fast is on Ekadashi and the parana on Dvadashi, in the morning; it must not be deferred to Trayodashi - "that would destroy the merit of twelve dvadasis". Kane allows the 13th in one case only: when no Dvadashi at all exists on the day after the fast.
Hari-Vasara, the first quarter of Dvadashi, lasts until 12:08 on 2026-11-21, so no parana window opens before then.
Nirnaya Sindhu I (Ekadashi-nirnaya; Nirnaya Sagara Press 1901, p.35), quoting the Vishnudharma through the Nirnayamrita and the Madanaratna: "द्वादश्याः प्रथमः पादो हरिवासरसंज्ञितः। तमतिक्रम्य कुर्वीत पारणं विष्णुतत्परः॥" - the first quarter of Dvadashi is called Hari-Vasara, and the parana is made after it. Dharmasindhu I (Nirnaya Sagara Press 1888, p.19) gives the rule for a long Dvadashi, and a quarter of Dvadashi can only reach past sunrise when most of the tithi still lies ahead.
Hari-Vasara outlasts the first three muhurtas of 2026-11-21, and many, the Dharmasindhu reports (p.19), hold the morning parana to those three and not to midday, so the parana is given in aparahna.
Arunodaya (the last 4 ghatikas before sunrise): Kane, History of Dharmasastra V.i pp.113-115: the Smarta is affected by suryodaya-vedha only, while the Vaishnava is affected by arunodaya-vedha as well - if Dashami persists into the last four ghatikas before sunrise, that Ekadashi is rejected for the Vaishnava and the fast moves to the next day. Garuda and Bhavisya make Ekadashi sampurna only if it also exists two muhurtas (= four ghatikas) before the sunrise of the day it fills.
Vaishnava reckoning, kshaya Ekadashi: Dashami holds the only sunrise the tithi falls after, so that day is rejected and the fast is on the day wholly covered by Dvadashi.
Kane, History of Dharmasastra V.i pp.114-115: the Smarta is bound by suryodaya-vedha only, and the texts allow a fast on Ekadashi mixed with Dashami to Smartas and never to Vaishnavas; for the Vaishnava, Dashami at sunrise rejects the day and the fast is on the day wholly covered by Dvadashi, with the parana on the next. Nirnayasindhu I (Ekadashi-nirnaya; Khemraj 1913 ed. with the Setu commentary, p.94) confines the take-the-later-day resolution to Vaishnavas (tad vaisnava-visayam), householders taking the earlier day.
This Ekadashi is kshaya (07:16 on 2026-11-20 to 06:32 on 2026-11-21). Dashami holds the sunrise of 2026-11-20, which the Vaishnava rejects, so the fast is on 2026-11-21 - the day wholly covered by Dvadashi - and the parana on the day after.
Kane, History of Dharmasastra V.i pp.114-115: the Smarta is bound by suryodaya-vedha only, and the texts allow a fast on Ekadashi mixed with Dashami to Smartas and never to Vaishnavas; for the Vaishnava, Dashami at sunrise rejects the day and the fast is on the day wholly covered by Dvadashi, with the parana on the next. Nirnayasindhu I (Ekadashi-nirnaya; Khemraj 1913 ed. with the Setu commentary, p.94) confines the take-the-later-day resolution to Vaishnavas (tad vaisnava-visayam), householders taking the earlier day.
The tithi at sunrise on this day is 12 (Shukla); the fast is for the Ekadashi that preceded it.
Kane, History of Dharmasastra V.i p.120 (Kurma Purana): the fast is on Ekadashi and the parana on Dvadashi, in the morning; it must not be deferred to Trayodashi - "that would destroy the merit of twelve dvadasis". Kane allows the 13th in one case only: when no Dvadashi at all exists on the day after the fast.
This parana falls on Trayodashi - allowed only because no Dvadashi exists on the day after the fast.
Dvadashi ended at 04:57 on 2026-11-22, before sunrise on the day after the fast, so no Dvadashi exists on that day. This is the single case in which Kane allows the parana on Trayodashi.
Arunodaya (the last 4 ghatikas before sunrise): Kane, History of Dharmasastra V.i pp.113-115: the Smarta is affected by suryodaya-vedha only, while the Vaishnava is affected by arunodaya-vedha as well - if Dashami persists into the last four ghatikas before sunrise, that Ekadashi is rejected for the Vaishnava and the fast moves to the next day. Garuda and Bhavisya make Ekadashi sampurna only if it also exists two muhurtas (= four ghatikas) before the sunrise of the day it fills.
Smarta reckoning: the day whose sunrise falls inside the Ekadashi tithi (suryodaya-vedha only).
Kane, History of Dharmasastra V.i pp.113-115: the Smarta is affected by suryodaya-vedha only, while the Vaishnava is affected by arunodaya-vedha as well - if Dashami persists into the last four ghatikas before sunrise, that Ekadashi is rejected for the Vaishnava and the fast moves to the next day. Garuda and Bhavisya make Ekadashi sampurna only if it also exists two muhurtas (= four ghatikas) before the sunrise of the day it fills.
Dashami had ended before arunodaya opened on 2026-12-04, so both lineages keep the fast on the same day.
Narada Purana purvardha 29.39-40, reported by Kane V.i p.114: "all should accept ekadasi free from dasami."
Kane, History of Dharmasastra V.i p.120 (Kurma Purana): the fast is on Ekadashi and the parana on Dvadashi, in the morning; it must not be deferred to Trayodashi - "that would destroy the merit of twelve dvadasis". Kane allows the 13th in one case only: when no Dvadashi at all exists on the day after the fast.
Hari-Vasara, the first quarter of Dvadashi, ended at 06:02 on 2026-12-05, before sunrise, so it does not delay the parana.
Nirnaya Sindhu I (Ekadashi-nirnaya; Nirnaya Sagara Press 1901, p.35), quoting the Vishnudharma through the Nirnayamrita and the Madanaratna: "द्वादश्याः प्रथमः पादो हरिवासरसंज्ञितः। तमतिक्रम्य कुर्वीत पारणं विष्णुतत्परः॥" - the first quarter of Dvadashi is called Hari-Vasara, and the parana is made after it. Dharmasindhu I (Nirnaya Sagara Press 1888, p.19) gives the rule for a long Dvadashi, and a quarter of Dvadashi can only reach past sunrise when most of the tithi still lies ahead.
Arunodaya (the last 4 ghatikas before sunrise): Kane, History of Dharmasastra V.i pp.113-115: the Smarta is affected by suryodaya-vedha only, while the Vaishnava is affected by arunodaya-vedha as well - if Dashami persists into the last four ghatikas before sunrise, that Ekadashi is rejected for the Vaishnava and the fast moves to the next day. Garuda and Bhavisya make Ekadashi sampurna only if it also exists two muhurtas (= four ghatikas) before the sunrise of the day it fills.
Vaishnava reckoning: suryodaya-vedha plus arunodaya-vedha - an Ekadashi whose Dashami runs into the last four ghatikas before sunrise is rejected.
Kane, History of Dharmasastra V.i pp.113-115: the Smarta is affected by suryodaya-vedha only, while the Vaishnava is affected by arunodaya-vedha as well - if Dashami persists into the last four ghatikas before sunrise, that Ekadashi is rejected for the Vaishnava and the fast moves to the next day. Garuda and Bhavisya make Ekadashi sampurna only if it also exists two muhurtas (= four ghatikas) before the sunrise of the day it fills.
Dashami had ended before arunodaya opened on 2026-12-04, so the Vaishnava fast falls on the same day as the Smarta one.
Kane, History of Dharmasastra V.i p.113: sannyasins and widows follow the Vaishnava reckoning. On a doubled Ekadashi, Narada Purana purvardha 29.45 gives the earlier day to householders and the later to ascetics - a third axis, orthogonal to Smarta/Vaishnava and not emitted as a separate date here.
Kane, History of Dharmasastra V.i p.120 (Kurma Purana): the fast is on Ekadashi and the parana on Dvadashi, in the morning; it must not be deferred to Trayodashi - "that would destroy the merit of twelve dvadasis". Kane allows the 13th in one case only: when no Dvadashi at all exists on the day after the fast.
Hari-Vasara, the first quarter of Dvadashi, ended at 06:02 on 2026-12-05, before sunrise, so it does not delay the parana.
Nirnaya Sindhu I (Ekadashi-nirnaya; Nirnaya Sagara Press 1901, p.35), quoting the Vishnudharma through the Nirnayamrita and the Madanaratna: "द्वादश्याः प्रथमः पादो हरिवासरसंज्ञितः। तमतिक्रम्य कुर्वीत पारणं विष्णुतत्परः॥" - the first quarter of Dvadashi is called Hari-Vasara, and the parana is made after it. Dharmasindhu I (Nirnaya Sagara Press 1888, p.19) gives the rule for a long Dvadashi, and a quarter of Dvadashi can only reach past sunrise when most of the tithi still lies ahead.
Arunodaya (the last 4 ghatikas before sunrise): Kane, History of Dharmasastra V.i pp.113-115: the Smarta is affected by suryodaya-vedha only, while the Vaishnava is affected by arunodaya-vedha as well - if Dashami persists into the last four ghatikas before sunrise, that Ekadashi is rejected for the Vaishnava and the fast moves to the next day. Garuda and Bhavisya make Ekadashi sampurna only if it also exists two muhurtas (= four ghatikas) before the sunrise of the day it fills.
Smarta reckoning: the day whose sunrise falls inside the Ekadashi tithi (suryodaya-vedha only).
Kane, History of Dharmasastra V.i pp.113-115: the Smarta is affected by suryodaya-vedha only, while the Vaishnava is affected by arunodaya-vedha as well - if Dashami persists into the last four ghatikas before sunrise, that Ekadashi is rejected for the Vaishnava and the fast moves to the next day. Garuda and Bhavisya make Ekadashi sampurna only if it also exists two muhurtas (= four ghatikas) before the sunrise of the day it fills.
Dashami had ended before arunodaya opened on 2026-12-20, so both lineages keep the fast on the same day.
Narada Purana purvardha 29.39-40, reported by Kane V.i p.114: "all should accept ekadasi free from dasami."
Kane, History of Dharmasastra V.i p.120 (Kurma Purana): the fast is on Ekadashi and the parana on Dvadashi, in the morning; it must not be deferred to Trayodashi - "that would destroy the merit of twelve dvadasis". Kane allows the 13th in one case only: when no Dvadashi at all exists on the day after the fast.
Hari-Vasara, the first quarter of Dvadashi, ended at 01:36 on 2026-12-21, before sunrise, so it does not delay the parana.
Nirnaya Sindhu I (Ekadashi-nirnaya; Nirnaya Sagara Press 1901, p.35), quoting the Vishnudharma through the Nirnayamrita and the Madanaratna: "द्वादश्याः प्रथमः पादो हरिवासरसंज्ञितः। तमतिक्रम्य कुर्वीत पारणं विष्णुतत्परः॥" - the first quarter of Dvadashi is called Hari-Vasara, and the parana is made after it. Dharmasindhu I (Nirnaya Sagara Press 1888, p.19) gives the rule for a long Dvadashi, and a quarter of Dvadashi can only reach past sunrise when most of the tithi still lies ahead.
Arunodaya (the last 4 ghatikas before sunrise): Kane, History of Dharmasastra V.i pp.113-115: the Smarta is affected by suryodaya-vedha only, while the Vaishnava is affected by arunodaya-vedha as well - if Dashami persists into the last four ghatikas before sunrise, that Ekadashi is rejected for the Vaishnava and the fast moves to the next day. Garuda and Bhavisya make Ekadashi sampurna only if it also exists two muhurtas (= four ghatikas) before the sunrise of the day it fills.
Vaishnava reckoning: suryodaya-vedha plus arunodaya-vedha - an Ekadashi whose Dashami runs into the last four ghatikas before sunrise is rejected.
Kane, History of Dharmasastra V.i pp.113-115: the Smarta is affected by suryodaya-vedha only, while the Vaishnava is affected by arunodaya-vedha as well - if Dashami persists into the last four ghatikas before sunrise, that Ekadashi is rejected for the Vaishnava and the fast moves to the next day. Garuda and Bhavisya make Ekadashi sampurna only if it also exists two muhurtas (= four ghatikas) before the sunrise of the day it fills.
Dashami had ended before arunodaya opened on 2026-12-20, so the Vaishnava fast falls on the same day as the Smarta one.
Kane, History of Dharmasastra V.i p.113: sannyasins and widows follow the Vaishnava reckoning. On a doubled Ekadashi, Narada Purana purvardha 29.45 gives the earlier day to householders and the later to ascetics - a third axis, orthogonal to Smarta/Vaishnava and not emitted as a separate date here.
Kane, History of Dharmasastra V.i p.120 (Kurma Purana): the fast is on Ekadashi and the parana on Dvadashi, in the morning; it must not be deferred to Trayodashi - "that would destroy the merit of twelve dvadasis". Kane allows the 13th in one case only: when no Dvadashi at all exists on the day after the fast.
Hari-Vasara, the first quarter of Dvadashi, ended at 01:36 on 2026-12-21, before sunrise, so it does not delay the parana.
Nirnaya Sindhu I (Ekadashi-nirnaya; Nirnaya Sagara Press 1901, p.35), quoting the Vishnudharma through the Nirnayamrita and the Madanaratna: "द्वादश्याः प्रथमः पादो हरिवासरसंज्ञितः। तमतिक्रम्य कुर्वीत पारणं विष्णुतत्परः॥" - the first quarter of Dvadashi is called Hari-Vasara, and the parana is made after it. Dharmasindhu I (Nirnaya Sagara Press 1888, p.19) gives the rule for a long Dvadashi, and a quarter of Dvadashi can only reach past sunrise when most of the tithi still lies ahead.
Arunodaya (the last 4 ghatikas before sunrise): Kane, History of Dharmasastra V.i pp.113-115: the Smarta is affected by suryodaya-vedha only, while the Vaishnava is affected by arunodaya-vedha as well - if Dashami persists into the last four ghatikas before sunrise, that Ekadashi is rejected for the Vaishnava and the fast moves to the next day. Garuda and Bhavisya make Ekadashi sampurna only if it also exists two muhurtas (= four ghatikas) before the sunrise of the day it fills.
Smarta reckoning: the day whose sunrise falls inside the Ekadashi tithi (suryodaya-vedha only).
Kane, History of Dharmasastra V.i pp.113-115: the Smarta is affected by suryodaya-vedha only, while the Vaishnava is affected by arunodaya-vedha as well - if Dashami persists into the last four ghatikas before sunrise, that Ekadashi is rejected for the Vaishnava and the fast moves to the next day. Garuda and Bhavisya make Ekadashi sampurna only if it also exists two muhurtas (= four ghatikas) before the sunrise of the day it fills.
Dashami had ended before arunodaya opened on 2027-01-03, so both lineages keep the fast on the same day.
Narada Purana purvardha 29.39-40, reported by Kane V.i p.114: "all should accept ekadasi free from dasami."
Kane, History of Dharmasastra V.i p.120 (Kurma Purana): the fast is on Ekadashi and the parana on Dvadashi, in the morning; it must not be deferred to Trayodashi - "that would destroy the merit of twelve dvadasis". Kane allows the 13th in one case only: when no Dvadashi at all exists on the day after the fast.
Hari-Vasara, the first quarter of Dvadashi, ended at 22:41 on 2027-01-03, before sunrise, so it does not delay the parana.
Nirnaya Sindhu I (Ekadashi-nirnaya; Nirnaya Sagara Press 1901, p.35), quoting the Vishnudharma through the Nirnayamrita and the Madanaratna: "द्वादश्याः प्रथमः पादो हरिवासरसंज्ञितः। तमतिक्रम्य कुर्वीत पारणं विष्णुतत्परः॥" - the first quarter of Dvadashi is called Hari-Vasara, and the parana is made after it. Dharmasindhu I (Nirnaya Sagara Press 1888, p.19) gives the rule for a long Dvadashi, and a quarter of Dvadashi can only reach past sunrise when most of the tithi still lies ahead.
Arunodaya (the last 4 ghatikas before sunrise): Kane, History of Dharmasastra V.i pp.113-115: the Smarta is affected by suryodaya-vedha only, while the Vaishnava is affected by arunodaya-vedha as well - if Dashami persists into the last four ghatikas before sunrise, that Ekadashi is rejected for the Vaishnava and the fast moves to the next day. Garuda and Bhavisya make Ekadashi sampurna only if it also exists two muhurtas (= four ghatikas) before the sunrise of the day it fills.
Vaishnava reckoning: suryodaya-vedha plus arunodaya-vedha - an Ekadashi whose Dashami runs into the last four ghatikas before sunrise is rejected.
Kane, History of Dharmasastra V.i pp.113-115: the Smarta is affected by suryodaya-vedha only, while the Vaishnava is affected by arunodaya-vedha as well - if Dashami persists into the last four ghatikas before sunrise, that Ekadashi is rejected for the Vaishnava and the fast moves to the next day. Garuda and Bhavisya make Ekadashi sampurna only if it also exists two muhurtas (= four ghatikas) before the sunrise of the day it fills.
Dashami had ended before arunodaya opened on 2027-01-03, so the Vaishnava fast falls on the same day as the Smarta one.
Kane, History of Dharmasastra V.i p.113: sannyasins and widows follow the Vaishnava reckoning. On a doubled Ekadashi, Narada Purana purvardha 29.45 gives the earlier day to householders and the later to ascetics - a third axis, orthogonal to Smarta/Vaishnava and not emitted as a separate date here.
Kane, History of Dharmasastra V.i p.120 (Kurma Purana): the fast is on Ekadashi and the parana on Dvadashi, in the morning; it must not be deferred to Trayodashi - "that would destroy the merit of twelve dvadasis". Kane allows the 13th in one case only: when no Dvadashi at all exists on the day after the fast.
Hari-Vasara, the first quarter of Dvadashi, ended at 22:41 on 2027-01-03, before sunrise, so it does not delay the parana.
Nirnaya Sindhu I (Ekadashi-nirnaya; Nirnaya Sagara Press 1901, p.35), quoting the Vishnudharma through the Nirnayamrita and the Madanaratna: "द्वादश्याः प्रथमः पादो हरिवासरसंज्ञितः। तमतिक्रम्य कुर्वीत पारणं विष्णुतत्परः॥" - the first quarter of Dvadashi is called Hari-Vasara, and the parana is made after it. Dharmasindhu I (Nirnaya Sagara Press 1888, p.19) gives the rule for a long Dvadashi, and a quarter of Dvadashi can only reach past sunrise when most of the tithi still lies ahead.
Arunodaya (the last 4 ghatikas before sunrise): Kane, History of Dharmasastra V.i pp.113-115: the Smarta is affected by suryodaya-vedha only, while the Vaishnava is affected by arunodaya-vedha as well - if Dashami persists into the last four ghatikas before sunrise, that Ekadashi is rejected for the Vaishnava and the fast moves to the next day. Garuda and Bhavisya make Ekadashi sampurna only if it also exists two muhurtas (= four ghatikas) before the sunrise of the day it fills.
Smarta reckoning: the day whose sunrise falls inside the Ekadashi tithi (suryodaya-vedha only).
Kane, History of Dharmasastra V.i pp.113-115: the Smarta is affected by suryodaya-vedha only, while the Vaishnava is affected by arunodaya-vedha as well - if Dashami persists into the last four ghatikas before sunrise, that Ekadashi is rejected for the Vaishnava and the fast moves to the next day. Garuda and Bhavisya make Ekadashi sampurna only if it also exists two muhurtas (= four ghatikas) before the sunrise of the day it fills.
Dashami had ended before arunodaya opened on 2027-01-19, so both lineages keep the fast on the same day.
Narada Purana purvardha 29.39-40, reported by Kane V.i p.114: "all should accept ekadasi free from dasami."
Kane, History of Dharmasastra V.i p.120 (Kurma Purana): the fast is on Ekadashi and the parana on Dvadashi, in the morning; it must not be deferred to Trayodashi - "that would destroy the merit of twelve dvadasis". Kane allows the 13th in one case only: when no Dvadashi at all exists on the day after the fast.
This parana falls on Trayodashi - allowed only because no Dvadashi exists on the day after the fast.
Dvadashi ended at 04:42 on 2027-01-20, before sunrise on the day after the fast, so no Dvadashi exists on that day. This is the single case in which Kane allows the parana on Trayodashi.
Arunodaya (the last 4 ghatikas before sunrise): Kane, History of Dharmasastra V.i pp.113-115: the Smarta is affected by suryodaya-vedha only, while the Vaishnava is affected by arunodaya-vedha as well - if Dashami persists into the last four ghatikas before sunrise, that Ekadashi is rejected for the Vaishnava and the fast moves to the next day. Garuda and Bhavisya make Ekadashi sampurna only if it also exists two muhurtas (= four ghatikas) before the sunrise of the day it fills.
Vaishnava reckoning: suryodaya-vedha plus arunodaya-vedha - an Ekadashi whose Dashami runs into the last four ghatikas before sunrise is rejected.
Kane, History of Dharmasastra V.i pp.113-115: the Smarta is affected by suryodaya-vedha only, while the Vaishnava is affected by arunodaya-vedha as well - if Dashami persists into the last four ghatikas before sunrise, that Ekadashi is rejected for the Vaishnava and the fast moves to the next day. Garuda and Bhavisya make Ekadashi sampurna only if it also exists two muhurtas (= four ghatikas) before the sunrise of the day it fills.
Dashami had ended before arunodaya opened on 2027-01-19, so the Vaishnava fast falls on the same day as the Smarta one.
Kane, History of Dharmasastra V.i p.113: sannyasins and widows follow the Vaishnava reckoning. On a doubled Ekadashi, Narada Purana purvardha 29.45 gives the earlier day to householders and the later to ascetics - a third axis, orthogonal to Smarta/Vaishnava and not emitted as a separate date here.
Kane, History of Dharmasastra V.i p.120 (Kurma Purana): the fast is on Ekadashi and the parana on Dvadashi, in the morning; it must not be deferred to Trayodashi - "that would destroy the merit of twelve dvadasis". Kane allows the 13th in one case only: when no Dvadashi at all exists on the day after the fast.
This parana falls on Trayodashi - allowed only because no Dvadashi exists on the day after the fast.
Dvadashi ended at 04:42 on 2027-01-20, before sunrise on the day after the fast, so no Dvadashi exists on that day. This is the single case in which Kane allows the parana on Trayodashi.
Arunodaya (the last 4 ghatikas before sunrise): Kane, History of Dharmasastra V.i pp.113-115: the Smarta is affected by suryodaya-vedha only, while the Vaishnava is affected by arunodaya-vedha as well - if Dashami persists into the last four ghatikas before sunrise, that Ekadashi is rejected for the Vaishnava and the fast moves to the next day. Garuda and Bhavisya make Ekadashi sampurna only if it also exists two muhurtas (= four ghatikas) before the sunrise of the day it fills.
Smarta reckoning: the day whose sunrise falls inside the Ekadashi tithi (suryodaya-vedha only).
Kane, History of Dharmasastra V.i pp.113-115: the Smarta is affected by suryodaya-vedha only, while the Vaishnava is affected by arunodaya-vedha as well - if Dashami persists into the last four ghatikas before sunrise, that Ekadashi is rejected for the Vaishnava and the fast moves to the next day. Garuda and Bhavisya make Ekadashi sampurna only if it also exists two muhurtas (= four ghatikas) before the sunrise of the day it fills.
Dashami had ended before arunodaya opened on 2027-02-02, so both lineages keep the fast on the same day.
Narada Purana purvardha 29.39-40, reported by Kane V.i p.114: "all should accept ekadasi free from dasami."
Kane, History of Dharmasastra V.i p.120 (Kurma Purana): the fast is on Ekadashi and the parana on Dvadashi, in the morning; it must not be deferred to Trayodashi - "that would destroy the merit of twelve dvadasis". Kane allows the 13th in one case only: when no Dvadashi at all exists on the day after the fast.
Hari-Vasara, the first quarter of Dvadashi, ended at 17:51 on 2027-02-02, before sunrise, so it does not delay the parana.
Nirnaya Sindhu I (Ekadashi-nirnaya; Nirnaya Sagara Press 1901, p.35), quoting the Vishnudharma through the Nirnayamrita and the Madanaratna: "द्वादश्याः प्रथमः पादो हरिवासरसंज्ञितः। तमतिक्रम्य कुर्वीत पारणं विष्णुतत्परः॥" - the first quarter of Dvadashi is called Hari-Vasara, and the parana is made after it. Dharmasindhu I (Nirnaya Sagara Press 1888, p.19) gives the rule for a long Dvadashi, and a quarter of Dvadashi can only reach past sunrise when most of the tithi still lies ahead.
Arunodaya (the last 4 ghatikas before sunrise): Kane, History of Dharmasastra V.i pp.113-115: the Smarta is affected by suryodaya-vedha only, while the Vaishnava is affected by arunodaya-vedha as well - if Dashami persists into the last four ghatikas before sunrise, that Ekadashi is rejected for the Vaishnava and the fast moves to the next day. Garuda and Bhavisya make Ekadashi sampurna only if it also exists two muhurtas (= four ghatikas) before the sunrise of the day it fills.
Vaishnava reckoning: suryodaya-vedha plus arunodaya-vedha - an Ekadashi whose Dashami runs into the last four ghatikas before sunrise is rejected.
Kane, History of Dharmasastra V.i pp.113-115: the Smarta is affected by suryodaya-vedha only, while the Vaishnava is affected by arunodaya-vedha as well - if Dashami persists into the last four ghatikas before sunrise, that Ekadashi is rejected for the Vaishnava and the fast moves to the next day. Garuda and Bhavisya make Ekadashi sampurna only if it also exists two muhurtas (= four ghatikas) before the sunrise of the day it fills.
Dashami had ended before arunodaya opened on 2027-02-02, so the Vaishnava fast falls on the same day as the Smarta one.
Kane, History of Dharmasastra V.i p.113: sannyasins and widows follow the Vaishnava reckoning. On a doubled Ekadashi, Narada Purana purvardha 29.45 gives the earlier day to householders and the later to ascetics - a third axis, orthogonal to Smarta/Vaishnava and not emitted as a separate date here.
Kane, History of Dharmasastra V.i p.120 (Kurma Purana): the fast is on Ekadashi and the parana on Dvadashi, in the morning; it must not be deferred to Trayodashi - "that would destroy the merit of twelve dvadasis". Kane allows the 13th in one case only: when no Dvadashi at all exists on the day after the fast.
Hari-Vasara, the first quarter of Dvadashi, ended at 17:51 on 2027-02-02, before sunrise, so it does not delay the parana.
Nirnaya Sindhu I (Ekadashi-nirnaya; Nirnaya Sagara Press 1901, p.35), quoting the Vishnudharma through the Nirnayamrita and the Madanaratna: "द्वादश्याः प्रथमः पादो हरिवासरसंज्ञितः। तमतिक्रम्य कुर्वीत पारणं विष्णुतत्परः॥" - the first quarter of Dvadashi is called Hari-Vasara, and the parana is made after it. Dharmasindhu I (Nirnaya Sagara Press 1888, p.19) gives the rule for a long Dvadashi, and a quarter of Dvadashi can only reach past sunrise when most of the tithi still lies ahead.
Arunodaya (the last 4 ghatikas before sunrise): Kane, History of Dharmasastra V.i pp.113-115: the Smarta is affected by suryodaya-vedha only, while the Vaishnava is affected by arunodaya-vedha as well - if Dashami persists into the last four ghatikas before sunrise, that Ekadashi is rejected for the Vaishnava and the fast moves to the next day. Garuda and Bhavisya make Ekadashi sampurna only if it also exists two muhurtas (= four ghatikas) before the sunrise of the day it fills.
Smarta reckoning: the day whose sunrise falls inside the Ekadashi tithi (suryodaya-vedha only).
Kane, History of Dharmasastra V.i pp.113-115: the Smarta is affected by suryodaya-vedha only, while the Vaishnava is affected by arunodaya-vedha as well - if Dashami persists into the last four ghatikas before sunrise, that Ekadashi is rejected for the Vaishnava and the fast moves to the next day. Garuda and Bhavisya make Ekadashi sampurna only if it also exists two muhurtas (= four ghatikas) before the sunrise of the day it fills.
Dashami had ended before arunodaya opened on 2027-02-17, so both lineages keep the fast on the same day.
Narada Purana purvardha 29.39-40, reported by Kane V.i p.114: "all should accept ekadasi free from dasami."
Kane, History of Dharmasastra V.i p.120 (Kurma Purana): the fast is on Ekadashi and the parana on Dvadashi, in the morning; it must not be deferred to Trayodashi - "that would destroy the merit of twelve dvadasis". Kane allows the 13th in one case only: when no Dvadashi at all exists on the day after the fast.
Hari-Vasara, the first quarter of Dvadashi, ended at 22:46 on 2027-02-17, before sunrise, so it does not delay the parana.
Nirnaya Sindhu I (Ekadashi-nirnaya; Nirnaya Sagara Press 1901, p.35), quoting the Vishnudharma through the Nirnayamrita and the Madanaratna: "द्वादश्याः प्रथमः पादो हरिवासरसंज्ञितः। तमतिक्रम्य कुर्वीत पारणं विष्णुतत्परः॥" - the first quarter of Dvadashi is called Hari-Vasara, and the parana is made after it. Dharmasindhu I (Nirnaya Sagara Press 1888, p.19) gives the rule for a long Dvadashi, and a quarter of Dvadashi can only reach past sunrise when most of the tithi still lies ahead.
Arunodaya (the last 4 ghatikas before sunrise): Kane, History of Dharmasastra V.i pp.113-115: the Smarta is affected by suryodaya-vedha only, while the Vaishnava is affected by arunodaya-vedha as well - if Dashami persists into the last four ghatikas before sunrise, that Ekadashi is rejected for the Vaishnava and the fast moves to the next day. Garuda and Bhavisya make Ekadashi sampurna only if it also exists two muhurtas (= four ghatikas) before the sunrise of the day it fills.
Vaishnava reckoning: suryodaya-vedha plus arunodaya-vedha - an Ekadashi whose Dashami runs into the last four ghatikas before sunrise is rejected.
Kane, History of Dharmasastra V.i pp.113-115: the Smarta is affected by suryodaya-vedha only, while the Vaishnava is affected by arunodaya-vedha as well - if Dashami persists into the last four ghatikas before sunrise, that Ekadashi is rejected for the Vaishnava and the fast moves to the next day. Garuda and Bhavisya make Ekadashi sampurna only if it also exists two muhurtas (= four ghatikas) before the sunrise of the day it fills.
Dashami had ended before arunodaya opened on 2027-02-17, so the Vaishnava fast falls on the same day as the Smarta one.
Kane, History of Dharmasastra V.i p.113: sannyasins and widows follow the Vaishnava reckoning. On a doubled Ekadashi, Narada Purana purvardha 29.45 gives the earlier day to householders and the later to ascetics - a third axis, orthogonal to Smarta/Vaishnava and not emitted as a separate date here.
Kane, History of Dharmasastra V.i p.120 (Kurma Purana): the fast is on Ekadashi and the parana on Dvadashi, in the morning; it must not be deferred to Trayodashi - "that would destroy the merit of twelve dvadasis". Kane allows the 13th in one case only: when no Dvadashi at all exists on the day after the fast.
Hari-Vasara, the first quarter of Dvadashi, ended at 22:46 on 2027-02-17, before sunrise, so it does not delay the parana.
Nirnaya Sindhu I (Ekadashi-nirnaya; Nirnaya Sagara Press 1901, p.35), quoting the Vishnudharma through the Nirnayamrita and the Madanaratna: "द्वादश्याः प्रथमः पादो हरिवासरसंज्ञितः। तमतिक्रम्य कुर्वीत पारणं विष्णुतत्परः॥" - the first quarter of Dvadashi is called Hari-Vasara, and the parana is made after it. Dharmasindhu I (Nirnaya Sagara Press 1888, p.19) gives the rule for a long Dvadashi, and a quarter of Dvadashi can only reach past sunrise when most of the tithi still lies ahead.
Arunodaya (the last 4 ghatikas before sunrise): Kane, History of Dharmasastra V.i pp.113-115: the Smarta is affected by suryodaya-vedha only, while the Vaishnava is affected by arunodaya-vedha as well - if Dashami persists into the last four ghatikas before sunrise, that Ekadashi is rejected for the Vaishnava and the fast moves to the next day. Garuda and Bhavisya make Ekadashi sampurna only if it also exists two muhurtas (= four ghatikas) before the sunrise of the day it fills.
Smarta reckoning: the day whose sunrise falls inside the Ekadashi tithi (suryodaya-vedha only).
Kane, History of Dharmasastra V.i pp.113-115: the Smarta is affected by suryodaya-vedha only, while the Vaishnava is affected by arunodaya-vedha as well - if Dashami persists into the last four ghatikas before sunrise, that Ekadashi is rejected for the Vaishnava and the fast moves to the next day. Garuda and Bhavisya make Ekadashi sampurna only if it also exists two muhurtas (= four ghatikas) before the sunrise of the day it fills.
Dashami had ended before arunodaya opened on 2027-03-03, so both lineages keep the fast on the same day.
Narada Purana purvardha 29.39-40, reported by Kane V.i p.114: "all should accept ekadasi free from dasami."
Kane, History of Dharmasastra V.i p.120 (Kurma Purana): the fast is on Ekadashi and the parana on Dvadashi, in the morning; it must not be deferred to Trayodashi - "that would destroy the merit of twelve dvadasis". Kane allows the 13th in one case only: when no Dvadashi at all exists on the day after the fast.
Hari-Vasara, the first quarter of Dvadashi, lasts until 14:02 on 2027-03-04, so no parana window opens before then.
Nirnaya Sindhu I (Ekadashi-nirnaya; Nirnaya Sagara Press 1901, p.35), quoting the Vishnudharma through the Nirnayamrita and the Madanaratna: "द्वादश्याः प्रथमः पादो हरिवासरसंज्ञितः। तमतिक्रम्य कुर्वीत पारणं विष्णुतत्परः॥" - the first quarter of Dvadashi is called Hari-Vasara, and the parana is made after it. Dharmasindhu I (Nirnaya Sagara Press 1888, p.19) gives the rule for a long Dvadashi, and a quarter of Dvadashi can only reach past sunrise when most of the tithi still lies ahead.
Hari-Vasara outlasts the first three muhurtas of 2027-03-04, and many, the Dharmasindhu reports (p.19), hold the morning parana to those three and not to midday, so the parana is given in aparahna.
Arunodaya (the last 4 ghatikas before sunrise): Kane, History of Dharmasastra V.i pp.113-115: the Smarta is affected by suryodaya-vedha only, while the Vaishnava is affected by arunodaya-vedha as well - if Dashami persists into the last four ghatikas before sunrise, that Ekadashi is rejected for the Vaishnava and the fast moves to the next day. Garuda and Bhavisya make Ekadashi sampurna only if it also exists two muhurtas (= four ghatikas) before the sunrise of the day it fills.
Vaishnava reckoning: suryodaya-vedha plus arunodaya-vedha - an Ekadashi whose Dashami runs into the last four ghatikas before sunrise is rejected.
Kane, History of Dharmasastra V.i pp.113-115: the Smarta is affected by suryodaya-vedha only, while the Vaishnava is affected by arunodaya-vedha as well - if Dashami persists into the last four ghatikas before sunrise, that Ekadashi is rejected for the Vaishnava and the fast moves to the next day. Garuda and Bhavisya make Ekadashi sampurna only if it also exists two muhurtas (= four ghatikas) before the sunrise of the day it fills.
Dashami had ended before arunodaya opened on 2027-03-03, so the Vaishnava fast falls on the same day as the Smarta one.
Kane, History of Dharmasastra V.i p.113: sannyasins and widows follow the Vaishnava reckoning. On a doubled Ekadashi, Narada Purana purvardha 29.45 gives the earlier day to householders and the later to ascetics - a third axis, orthogonal to Smarta/Vaishnava and not emitted as a separate date here.
Kane, History of Dharmasastra V.i p.120 (Kurma Purana): the fast is on Ekadashi and the parana on Dvadashi, in the morning; it must not be deferred to Trayodashi - "that would destroy the merit of twelve dvadasis". Kane allows the 13th in one case only: when no Dvadashi at all exists on the day after the fast.
Hari-Vasara, the first quarter of Dvadashi, lasts until 14:02 on 2027-03-04, so no parana window opens before then.
Nirnaya Sindhu I (Ekadashi-nirnaya; Nirnaya Sagara Press 1901, p.35), quoting the Vishnudharma through the Nirnayamrita and the Madanaratna: "द्वादश्याः प्रथमः पादो हरिवासरसंज्ञितः। तमतिक्रम्य कुर्वीत पारणं विष्णुतत्परः॥" - the first quarter of Dvadashi is called Hari-Vasara, and the parana is made after it. Dharmasindhu I (Nirnaya Sagara Press 1888, p.19) gives the rule for a long Dvadashi, and a quarter of Dvadashi can only reach past sunrise when most of the tithi still lies ahead.
Hari-Vasara outlasts the first three muhurtas of 2027-03-04, and many, the Dharmasindhu reports (p.19), hold the morning parana to those three and not to midday, so the parana is given in aparahna.
Arunodaya (the last 4 ghatikas before sunrise): Kane, History of Dharmasastra V.i pp.113-115: the Smarta is affected by suryodaya-vedha only, while the Vaishnava is affected by arunodaya-vedha as well - if Dashami persists into the last four ghatikas before sunrise, that Ekadashi is rejected for the Vaishnava and the fast moves to the next day. Garuda and Bhavisya make Ekadashi sampurna only if it also exists two muhurtas (= four ghatikas) before the sunrise of the day it fills.
Smarta reckoning: the day whose sunrise falls inside the Ekadashi tithi (suryodaya-vedha only).
Kane, History of Dharmasastra V.i pp.113-115: the Smarta is affected by suryodaya-vedha only, while the Vaishnava is affected by arunodaya-vedha as well - if Dashami persists into the last four ghatikas before sunrise, that Ekadashi is rejected for the Vaishnava and the fast moves to the next day. Garuda and Bhavisya make Ekadashi sampurna only if it also exists two muhurtas (= four ghatikas) before the sunrise of the day it fills.
Dashami had ended before arunodaya opened on 2027-03-18, so both lineages keep the fast on the same day.
Narada Purana purvardha 29.39-40, reported by Kane V.i p.114: "all should accept ekadasi free from dasami."
Kane, History of Dharmasastra V.i p.120 (Kurma Purana): the fast is on Ekadashi and the parana on Dvadashi, in the morning; it must not be deferred to Trayodashi - "that would destroy the merit of twelve dvadasis". Kane allows the 13th in one case only: when no Dvadashi at all exists on the day after the fast.
Hari-Vasara, the first quarter of Dvadashi, lasts until 07:13 on 2027-03-19, so no parana window opens before then.
Nirnaya Sindhu I (Ekadashi-nirnaya; Nirnaya Sagara Press 1901, p.35), quoting the Vishnudharma through the Nirnayamrita and the Madanaratna: "द्वादश्याः प्रथमः पादो हरिवासरसंज्ञितः। तमतिक्रम्य कुर्वीत पारणं विष्णुतत्परः॥" - the first quarter of Dvadashi is called Hari-Vasara, and the parana is made after it. Dharmasindhu I (Nirnaya Sagara Press 1888, p.19) gives the rule for a long Dvadashi, and a quarter of Dvadashi can only reach past sunrise when most of the tithi still lies ahead.
Arunodaya (the last 4 ghatikas before sunrise): Kane, History of Dharmasastra V.i pp.113-115: the Smarta is affected by suryodaya-vedha only, while the Vaishnava is affected by arunodaya-vedha as well - if Dashami persists into the last four ghatikas before sunrise, that Ekadashi is rejected for the Vaishnava and the fast moves to the next day. Garuda and Bhavisya make Ekadashi sampurna only if it also exists two muhurtas (= four ghatikas) before the sunrise of the day it fills.
Vaishnava reckoning: suryodaya-vedha plus arunodaya-vedha - an Ekadashi whose Dashami runs into the last four ghatikas before sunrise is rejected.
Kane, History of Dharmasastra V.i pp.113-115: the Smarta is affected by suryodaya-vedha only, while the Vaishnava is affected by arunodaya-vedha as well - if Dashami persists into the last four ghatikas before sunrise, that Ekadashi is rejected for the Vaishnava and the fast moves to the next day. Garuda and Bhavisya make Ekadashi sampurna only if it also exists two muhurtas (= four ghatikas) before the sunrise of the day it fills.
Dashami had ended before arunodaya opened on 2027-03-18, so the Vaishnava fast falls on the same day as the Smarta one.
Kane, History of Dharmasastra V.i p.113: sannyasins and widows follow the Vaishnava reckoning. On a doubled Ekadashi, Narada Purana purvardha 29.45 gives the earlier day to householders and the later to ascetics - a third axis, orthogonal to Smarta/Vaishnava and not emitted as a separate date here.
Kane, History of Dharmasastra V.i p.120 (Kurma Purana): the fast is on Ekadashi and the parana on Dvadashi, in the morning; it must not be deferred to Trayodashi - "that would destroy the merit of twelve dvadasis". Kane allows the 13th in one case only: when no Dvadashi at all exists on the day after the fast.
Hari-Vasara, the first quarter of Dvadashi, lasts until 07:13 on 2027-03-19, so no parana window opens before then.
Nirnaya Sindhu I (Ekadashi-nirnaya; Nirnaya Sagara Press 1901, p.35), quoting the Vishnudharma through the Nirnayamrita and the Madanaratna: "द्वादश्याः प्रथमः पादो हरिवासरसंज्ञितः। तमतिक्रम्य कुर्वीत पारणं विष्णुतत्परः॥" - the first quarter of Dvadashi is called Hari-Vasara, and the parana is made after it. Dharmasindhu I (Nirnaya Sagara Press 1888, p.19) gives the rule for a long Dvadashi, and a quarter of Dvadashi can only reach past sunrise when most of the tithi still lies ahead.
Arunodaya (the last 4 ghatikas before sunrise): Kane, History of Dharmasastra V.i pp.113-115: the Smarta is affected by suryodaya-vedha only, while the Vaishnava is affected by arunodaya-vedha as well - if Dashami persists into the last four ghatikas before sunrise, that Ekadashi is rejected for the Vaishnava and the fast moves to the next day. Garuda and Bhavisya make Ekadashi sampurna only if it also exists two muhurtas (= four ghatikas) before the sunrise of the day it fills.
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Ekadashi means "the eleventh" and marks the eleventh tithi counted from each new moon (Amavasya) and each full moon (Purnima). Because there are two fortnights in a lunar month, every month brings a Shukla paksha Ekadashi and a Krishna paksha Ekadashi, each traditionally dedicated to Lord Vishnu.
There are two rules, not one. The Smarta reckoning takes the day whose sunrise falls inside the Ekadashi tithi - the Udaya Tithi. The Vaishnava reckoning applies a second test as well, arunodaya-vedha: if Dashami is still running in the last four ghatikas (a fixed 96 minutes) before that sunrise, the Ekadashi is rejected and the fast moves to the next day. The distinction is set out in Kane, History of Dharmasastra Vol. V Part I, pp. 113 to 115. This calendar shows both dates rather than picking one, and says which rule produced each.
Because both rules are anchored to sunrise, and sunrise moves with your longitude and latitude, the calendar date of an Ekadashi can differ from one city to another. That is why the tithi boundaries here are computed for the location you choose.
Devotees fast on Ekadashi and break it the next morning on Dwadashi during the Parana window, after sunrise and before the tithi ends. The strictness of the fast varies by tradition and by the person:
How strictly the fast is kept is a matter of tradition and of what a person can manage, and no rule in this calendar depends on it. The dates and the parana window are the same whichever form you keep, so choose the one your family or your health allows.
The parana is not a loose "break it next day" instruction, and this calendar renders the rule rather than a rule of thumb. Kane V.i p. 120, citing the Kurma Purana, is explicit: the fast is on Ekadashi and the parana on Dvadashi, in the morning, and it must not be deferred to Trayodashi, "that would destroy the merit of twelve dvadasis". Because the sources give two readings of "morning", each date shows both windows - the first three muhurtas of the day, and everything before midday - along with the instant Dvadashi ends, which is the hard outer bound. Every window opens only after Hari Vasara, the first quarter of the Dvadashi tithi: the Nirnaya Sindhu (p. 35, quoting the Vishnudharma through the Nirnayamrita and the Madanaratna) and the Dharmasindhu (p. 19) both put the parana after it, and the date shows when it ends. When it outlasts the first three muhurtas, the calendar shows aparahna instead, the afternoon the Dharmasindhu records as the other opinion: the many who keep the morning parana keep it to those three muhurtas and not to midday, so the rest of the forenoon is not offered. Kane allows the thirteenth in exactly one case: when no Dvadashi at all exists on the day after the fast, and the calendar labels that case when it occurs.
Two things this calendar does not compute, and says so instead of guessing. The four Brahmavaivarta vedhas of Ekadashi that Kane names and then expressly passes over are not reconstructible from their names alone. And another axis exists, orthogonal to Smarta and Vaishnava: on a doubled Ekadashi, Narada Purana purvardha 29.45 gives the earlier day to householders and the later to ascetics, while Kane p. 113 notes that sannyasins and widows follow the Vaishnava reckoning. That axis is not emitted as a separate date.
For educational purposes. Astrological interpretations are traditional and not a substitute for professional advice.