Panchang in Sevan, Gegharkunik, Armenia Sun 15 Dec 1963

Amavasya follows the tithi at sunrise. Amavasya runs from 03:40 on Sun 15 Dec to 06:06 on Mon 16 Dec, so it holds sunrise only on Sun 15 Dec, at 08:15. No text giving Amavasya’s time was found; sunrise is Tithika’s convention.

Amavasya: every date in Sevan

The Moon gains on the Sun about 12° a day. Each 12° of lead is one tithi: 348°–360° is the 30th, Krishna Amavasya. A day takes the tithi in force at its sunrise, 08:15 here. Chaturdashi ended at 03:40, before it. Amavasya ends at 06:06 Mon, when the lead reaches 360°. The lead passed 180° at the full moon of 1 Dec, so the Moon is waning: Krishna paksha.

The night of Sat 14 Dec ran from sunset 17:33 Sat to sunrise 08:15, 14 h 42 m. Cut into 15 muhurtas of 58 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 08:15 to 17:33, splits into 8 choghadiyas of 1 h 9 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 17:33 to 08:16 Mon, splits into 8 choghadiyas of 1 h 50 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The fixed stars divide the Moon's path into 27 nakshatras of 13°20′, each in 4 padas of 3°20′. Jyeshtha spans 226°40′–240°00′; the Moon entered its pada 1 at 226°40′. It leaves at 06:02 Mon, for Mula.

Add the Sun's and the Moon's places among the stars: 239.1° + 229.2° = 468.3°, one full turn and 108.3°. Past the turn, cut into 27 parts of 13°20′, it gives the yoga: 106°40′–120°00′ is the 9th, Shula. It ends at 05:58 Mon, then Ganda.

A karana is half a tithi: 6° of the Moon's lead, so the first half of Amavasya is Chatushpada and the second Nagava. Chatushpada runs until 16:54, when the lead reaches 354°; Nagava until 06:06 Mon.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 08:15 to 08:16 Mon, so the hours after midnight still belong to Raviwara.

An amanta month runs from new moon to new moon and takes its name from the rashi the Sun is in at the new moon that begins it: Tula gives Kartika. The Sun enters Vrishchika on 16 Nov and Dhanu on 16 Dec, both inside the month. The next new moon, 16 Dec, finds it in Dhanu and begins Pausha.

A purnimanta month runs from full moon to full moon, so its waning half comes first. It shares its name with the amanta month that its second half falls in: the new moon of 16 Dec, with the Sun in Dhanu, begins Pausha. Until then this Krishna paksha reads Pausha here, and Kartika in the amanta count.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 25 Mar 1963, 16:09 Mon. Since then the Sun has moved 258.3° round the stars. Vikram Samvat numbers that year 2020; Shaka Samvat numbers it 1885.