2039
- Monday, 24 January 2039 · Mauni Amavasya (Somvati)
- Wednesday, 23 February 2039 · Magha Amavasya
- Thursday, 24 March 2039 · Phalguna Amavasya
- Saturday, 23 April 2039 · Chaitra Amavasya (Shani)
- Sunday, 22 May 2039 · Vat Savitri Amavasya
- Tuesday, 21 June 2039 · Jyeshtha Amavasya (Bhaumvati)
- Thursday, 21 July 2039 · Hariyali Amavasya
- Friday, 19 August 2039 · Shravana Amavasya
- Sunday, 18 September 2039 · Mahalaya / Sarvapitri Amavasya
- Monday, 17 October 2039 · Adhika Ashwina Amavasya (Somvati)
- Wednesday, 16 November 2039 · Diwali (Lakshmi Puja) Amavasya
- Thursday, 15 December 2039 · Kartika Amavasya
2040
- Saturday, 14 January 2040 · Margashirsha Amavasya (Shani)
- Sunday, 12 February 2040 · Mauni Amavasya
- Tuesday, 13 March 2040 · Magha Amavasya (Bhaumvati)
- Wednesday, 11 April 2040 · Phalguna Amavasya
- Friday, 11 May 2040 · Chaitra Amavasya
- Saturday, 9 June 2040 · Vat Savitri Amavasya (Shani)
- Monday, 9 July 2040 · Jyeshtha Amavasya (Somvati)
- Tuesday, 7 August 2040 · Hariyali Amavasya (Bhaumvati)
- Thursday, 6 September 2040 · Shravana Amavasya
- Saturday, 6 October 2040 · Mahalaya / Sarvapitri Amavasya (Shani)
- Sunday, 4 November 2040 · Diwali (Lakshmi Puja) Amavasya
- Tuesday, 4 December 2040 · Kartika Amavasya (Bhaumvati)
How the date is fixed
Every new-moon day, taken as the day on which Amavasya is running at sunrise. One that falls on a Monday is called Somvati, on a Tuesday Bhaumvati, and on a Saturday Shani Amavasya. Amavasya ends the dark half, so both month names are given.
About
Amavasya is the tithi in which the Moon's longitude returns to the Sun's, closing the dark half and, in amanta reckoning, the month itself. It is the tithi of the pitris, and tarpana for ancestors is its regular observance; the aparahna (afternoon) is the governing period for shraddha, so the day whose afternoon carries Amavasya is chosen. Several named Amavasyas stand out: Sarva Pitru Amavasya ending Pitru Paksha, Diwali on Ashwina Amavasya, Mauni Amavasya in Pausha, and any Amavasya on a Monday (Somvati) or Saturday (Shani). Solar eclipses can only occur on Amavasya, which is why eclipse rules are tied to it.
How it is observed
Tarpana for ancestors in the afternoon, river bathing on Somvati and Mauni Amavasya, and lamps at dusk.