Panchang in Sevan, Gegharkunik, Armenia Sun 16 Oct 1921

Sharad Purnima’s night centres on nishitha, the midnight muhurta. Purnima runs from 00:59 on Sun 16 Oct to 01:57 on Mon 17 Oct, so only Sunday night’s nishitha (23:18–00:09 Mon) falls within it. No text giving Sharad Purnima’s time was found; nishitha is Tithika’s convention.

Sharad Purnima: every date in Sevan

Purnima follows the tithi at sunrise. Purnima runs from 00:59 on Sun 16 Oct to 01:57 on Mon 17 Oct, so it holds sunrise only on Sun 16 Oct, at 06:09. 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, 06:11 here. Chaturdashi ended at 01:01, before it. Purnima ends at 01:59 Mon, when the lead reaches 180°. The lead passed 0° at the new moon of 1 Oct, so the Moon is waxing: Shukla paksha.

The night of Sat 15 Oct ran from sunset 17:21 Sat to sunrise 06:11, 12 h 50 m. Cut into 15 muhurtas of 51 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 06:11 to 17:19, splits into 8 choghadiyas of 1 h 23 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 17:19 to 06:12 Mon, splits into 8 choghadiyas of 1 h 36 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′. Revati spans 346°40′–360°00′; the Moon entered its pada 1 at 346°40′. It leaves at 01:28 Mon, for Ashwini.

Add the Sun's and the Moon's places among the stars: 179.5° + 349.9° = 529.4°, one full turn and 169.4°. Past the turn, cut into 27 parts of 13°20′, it gives the yoga: 160°00′–173°20′ is the 13th, Vyaghata. It ends at 13:14, then Harshana.

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 13:34, when the lead reaches 174°; Bava until 01:59 Mon.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 06:11 to 06:12 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: Kanya gives Ashwina. The Sun enters Tula on 16 Oct, inside the month. The next new moon, 31 Oct, finds it in Tula and begins Kartika.

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 1 Oct, with the Sun in Kanya, began Ashwina. This Shukla paksha reads Ashwina in both counts.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 8 Apr 1921, 12:04 Fri. Since then the Sun has moved 184.3° round the stars. Vikram Samvat numbers that year 1978; Shaka Samvat numbers it 1843.