🪔 Festival calendar
Every festival and vrata of the year for your place, each on the day its tithi rule gives — midday, evening, midnight, moonrise or the day the tithi begins or ends, as the tradition keeps it — with the window it is kept in.
Working out the year…
Each observance falls on the day its tithi holds at the hour it is kept (the vyāpinī rule); where no hour is set, on the day the tithi begins or ends as tradition classes it, or the tithi at sunrise. Lunar months run new moon to new moon (amānta); in the north the dark fortnight is often named with the next month — the dates are the same.
Regional almanacs differ on a few days (a tithi covering the hour on two days, or neither); where a source records the difference it is shown. Check a festival you keep strictly against your family's almanac.
Observances of a nakṣatra fall on the day it holds at sunrise (the book's definition, given for Āvaṇi Aviṭṭam). The temple festivals of the solar month (Onam, Tai Pūsam, Kārttikai Dīpam and the rest) follow Tamil and Kerala tradition: a day counts in the month once the Sun has entered the sign by sunset, and if the nakṣatra comes twice in the month, the second is kept.
Eclipses are worked out for your place: visible means the Sun or Moon is above your horizon while it is eclipsed. Sūtaka is the tradition's restraint before an eclipse (four praharas before a solar eclipse, three before a lunar one). It is not in the owned texts, and it is shown only where the eclipse can be seen.