Some days are marked auspicious not by a tithi or a nakshatra alone but by a COMBINATION - a particular weekday falling with a particular asterism. Guru Pushya is the famous one: Thursday with Pushya. This finder scans forward from any date and lists every such window for your city, with its real start and end time, and it separates the combinations that are written in a classical text from the ones that only modern almanacs carry.
The five limbs of the panchang - tithi, vara, nakshatra, yoga and karana - are each read on their own. A combination yoga is a named rule about two or three of them coinciding: a weekday together with an asterism, sometimes with a tithi as well. Guru Pushya is Thursday with Pushya; Ravi Pushya is Sunday with Pushya; Amrit Siddhi is a septet, one asterism per weekday.
Because the Moon changes asterism roughly every twenty-five hours and the weekday changes at sunrise, a combination is almost never a whole day. It is the OVERLAP of the two, and that overlap can begin at eleven in the morning and end after the following sunrise. This finder computes the overlap rather than reading one value per calendar date, which is why the results carry a start time and an end time instead of just a date.
Kalaprakasika ch. XXXV, p. 206 closes the chapter with a septet of fortunate weekday-and-asterism pairs, and Thursday with Pushya is one of them. B. V. Raman's Muhurtha ch. VI lists the same septet and is the author who gives it the name Amrita Siddha. So the Thursday-Pushya cell is a single rule that has arrived under two names - the Sanskrit-sourced Siddha yoga and the popular Gurupushyamrut.
This finder reports it once. Printing Guru Pushya and Amrit Siddhi as two separate hits on the same afternoon would read to you as two independent endorsements of the same sentence in the same book, and on any page that ranks days, three chips beat two. One rule, one row.
The septet is not identical in the two texts. Kalaprakasika gives Monday with Mrigashira; Raman's Muhurtha gives Monday with Shravana. The other six cells agree exactly.
This app follows the Kalaprakasika reading, because Kalamrita and Muhurta Parijata are cited for the same Monday-Mrigashira pairing, which leaves the Raman cell as the lone outlier of four witnesses. That is a judgement, not a fact, so the alternative is stated here rather than quietly dropped. If you follow a panchang that marks Monday with Shravana as Amrit Siddhi, it is following Raman.
This is the part almost no calculator prints. Sarvartha Siddhi Yoga is the most widely published of the group, and a full-text search of both source texts for this chapter returns the term ZERO times in each - it is in neither Kalaprakasika nor Raman's Muhurtha. Ravi Pushya sits among the cells that neither source labels at all. Dwipushkar and Tripushkar have no attestation in any of the sixty source studies behind this engine.
None of them is deleted, because they are genuinely current in modern practice and hiding a widely used rule helps nobody. They are placed in a second tier and labelled, so that a traced classical combination and a modern almanac convention never sit on screen wearing the same badge.
Modern practice carries a specific exception to the Thursday-Pushya cell: it is AVOIDED for marriage. Two related exceptions travel with it - Griha Pravesha is avoided on Tuesday with Ashwini, and travel, particularly southward, on Saturday with Rohini. What the combination is considered good FOR is deliberately not stated on this page, in either direction: neither source text says, and this page does not fill that in.
These three exceptions are widely observed and, unlike the septet itself, they were not located in Kalaprakasika ch. XXXV or in Raman's Muhurtha. They are carried here as modern usage, labelled as such, because a reader planning a wedding is better served by an unattested caution stated honestly than by silence. If you are choosing a marriage date, use the Vivah Muhurat finder, which applies the marriage chapter's own conditions.
The weekday used is the classical vara, which runs from sunrise to the next sunrise rather than from midnight - so a window that opens at four in the morning belongs to the previous weekday, exactly as an almanac would print it. The asterism is taken from the Moon's real entry and exit instants, found by bisection on its longitude, not from a fixed daily rate.
Positions are computed to sub-arcsecond precision for the latitude and longitude of the city you choose, so sunrise, and therefore the vara boundary, is your own. Dates are available from 1801 to 2100; outside that range this app refuses the request rather than answering it from a lower-precision model.
For educational purposes. Astrological interpretations are traditional and not a substitute for professional advice.