Purnima is the full-moon tithi that closes the bright Shukla Paksha each lunar month, when the Moon sits directly opposite the Sun and its disc appears completely full. It is a traditional day of vrat (fasting) and worship — most often the Satyanarayan Vrat — and the tithi that carries festivals such as Guru Purnima, Sharad Purnima and Kartik Purnima. This calendar lists the upcoming Purnima vrat dates for your city; because a tithi begins and ends at a precise moment, each date is calculated for your location. No birth details are needed.
In the Vedic lunar calendar a tithi is the time the Moon takes to gain 12° on the Sun, and Purnima is the 15th and final tithi of the waxing Shukla Paksha. At that point the Moon is 180° from the Sun — directly opposite — so we see its face fully lit. The tithi that follows, Pratipada, opens the waning Krishna Paksha.
Purnima is widely kept as a vrat. Devotees fast through the day and perform the Satyanarayan Puja, traditionally breaking the fast after darshan of the risen full Moon. Because the vrat follows the tithi rather than the clock, this calendar converts each full-moon tithi to your local time so you know the correct day to observe it.
Every lunar month has one Purnima, and many are named for the festival they carry:
Purnima is a tithi, not a fixed calendar day — it begins and ends at the exact moment the Moon reaches 180° from the Sun. That moment is converted to your local time, so the day on which the full-moon tithi is current, and the day the vrat is kept, can differ by city and timezone.
It is a fast observed on the full-moon day, most commonly paired with the Satyanarayan Puja. Observers typically fast through the day and break it after offering worship to the risen full Moon, keeping the vrat for peace, prosperity and the fulfilment of wishes.
No. Purnima is the same full-moon tithi for everyone, so only your city matters — it lets the tithi's start and end be shown in your local time. The calendar needs just a location, not a birth date, time or place.
For educational purposes. Astrological interpretations are traditional and not a substitute for professional advice.