Amavasya 2028

In Delhi, 12 Amavasyas fall in 2028, one in each month. Five times the śrāddha falls on a different day from the fast: 25 March, 23 May, 21 July, 17 October, 15 December. The table lists every date.

The new moon: the thirtieth tithi, which ends the dark half (Krishna) of the lunar month. A tithi is the time the Moon takes to gain 12° on the Sun. In the amānta reckoning the Amāvasyā is the last day of the month. Surya Siddhanta 2.64, 2.66

The fast is kept on the later of the two days, the one joined to the next Pratipadā, and never on the day joined to Chaturdaśī. The Sāvitrī vrata is the exception and keeps the earlier day. Nirṇaya-sindhu p. 73

On the day whose aparāhṇa, the last third of the daytime, the Amāvasyā touches. When it touches both afternoons, the day whose kutapa, the 8th of the day’s 15 muhūrtas, it covers. Hemādri makes the kutapa the first test for households without sacred fires, and Hārīta’s rule by Vedic branch decides equal coverage. Nirṇaya-sindhu pp. 81⁠–⁠87

An Amāvasyā on a Monday (Somavatī) “gives fruit like the equinox”, and on a Tuesday (Bhauma) bathing in the Gaṅgā gives the fruit of a thousand cows. The weekday here is that of the fast day. Nirṇaya-sindhu p. 73 (Śātātapa, Vyāsa)

Each date is worked out for the city’s own sunrise and afternoon. The Amāvasyā begins and ends at the same moment everywhere, but which sunrise and afternoon it reaches depends on the city, so cities far apart can keep different days.