Panchang in Sevan, Gegharkunik, Armenia Fri 18 Dec 1964

Purnima follows the tithi at sunrise. Purnima begins at 10:21 on Fri 18 Dec, after that sunrise, and ends at 06:41 on Sat 19 Dec, before the next: it holds no sunrise. A tithi that holds no sunrise is kept on the day it is current: Fri 18 Dec. No text giving Purnima’s time was found; sunrise is Tithika’s convention.

Purnima: every date in Sevan

The Moon gains on the Sun about 12° a day. Each 12° of lead is one tithi: 156°–168° is the 14th, Shukla Chaturdashi. A day takes the tithi in force at its sunrise, 08:18 here. Trayodashi ended at 13:46 Thu, before it. Chaturdashi ends at 10:21, when the lead reaches 168°. The lead passed 0° at the new moon of 4 Dec, so the Moon is waxing: Shukla paksha.

A day takes the tithi in force at its sunrise. Purnima began at 10:21 and ended at 06:41 Sat, between the sunrises of 08:18 and 08:18 Sat. Friday reads Chaturdashi and Saturday reads Pratipada: Purnima is a kshaya tithi here.

The night of Thu 17 Dec ran from sunset 17:34 Thu to sunrise 08:18, 14 h 44 m. Cut into 15 muhurtas of 58 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 08:18 to 17:35, 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, 17:35 to 08:18 Sat, 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′. Rohini spans 40°00′–53°20′; the Moon entered its pada 3 at 46°40′. It leaves at 14:02, for Mrigashira.

Add the Sun's and the Moon's places among the stars: 242.9° + 49.7° = 292.6°. The sum, cut into 27 parts of 13°20′, gives the yoga: 280°00′–293°20′ is the 22nd, Sadhya. It ends at 09:19, then Shubha.

A karana is half a tithi: 6° of the Moon's lead, so the first half of Chaturdashi is Garaja and the second Vanija. Garaja ended at 00:06, when the lead reached 162°; Vanija runs until 10:21.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 08:18 to 08:18 Sat, so the hours after midnight still belong to Shukrawara.

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: Vrishchika gives Margashirsha. The Sun enters Dhanu on 15 Dec, inside the month. The next new moon, 3 Jan, 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 4 Dec, with the Sun in Vrishchika, began Margashirsha. This Shukla paksha reads Margashirsha in both counts.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 14 Mar 1964, 06:13 Sat. Since then the Sun has moved 272.7° round the stars. Vikram Samvat numbers that year 2021; Shaka Samvat numbers it 1886.