Panchang in Sevan, Gegharkunik, Armenia Thu 29 May 1980

Purnima follows the tithi at sunrise. Purnima runs from 00:44 on Thu 29 May to 01:27 on Fri 30 May, so it holds sunrise only on Thu 29 May, at 05:33. 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: 168°–180° is the 15th, Shukla Purnima. A day takes the tithi in force at its sunrise, 05:33 here. Chaturdashi ended at 00:44, before it. Purnima ends at 01:27 Fri, when the lead reaches 180°. The lead passed 0° at the new moon of 14 May, so the Moon is waxing: Shukla paksha.

The night of Wed 28 May ran from sunset 20:21 Wed to sunrise 05:33, 9 h 12 m. Cut into 15 muhurtas of 36 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 05:33 to 20:21, splits into 8 choghadiyas of 1 h 51 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 20:21 to 05:32 Fri, splits into 8 choghadiyas of 1 h 8 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′. Anuradha spans 213°20′–226°40′; the Moon entered its pada 1 at 213°20′. It leaves at 04:30 Fri, for Jyeshtha.

Add the Sun's and the Moon's places among the stars: 44.3° + 214.6° = 258.9°. The sum, cut into 27 parts of 13°20′, gives the yoga: 253°20′–266°40′ is the 20th, Shiva. It ends at 19:25, then Siddha.

A karana is half a tithi: 6° of the Moon's lead, so the first half of Purnima is Vishti and the second Bava. Vishti runs until 13:09, when the lead reaches 174°; Bava until 01:27 Fri.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 05:33 to 05:32 Fri, so the hours after midnight still belong to Guruwara.

A month normally holds one sankranti, the Sun's entry into a new rashi. From 14 May 16:00 Wed to 13 Jun 00:38 Fri the Sun stayed in Vrishabha, entering Mithuna at 14 Jun 16:25 Sat, after the new moon. A month with no sankranti is Adhika Jyeshtha, before Jyeshtha itself.

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 14 May, with the Sun in Vrishabha, began Jyeshtha (Adhik). This Shukla paksha reads Jyeshtha (Adhik) in both counts.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 16 Mar 1980, 22:55 Sun. Since then the Sun has moved 71.5° round the stars. Vikram Samvat numbers that year 2037; Shaka Samvat numbers it 1902.