Panchang in Ipameri, Goiás, Brazil Mon 12 Oct 1981

Sharad Purnima’s night centres on nishitha, the midnight muhurta. Purnima runs from 12:56 on Mon 12 Oct to 09:49 on Tue 13 Oct, so only Monday night’s nishitha (23:35–00:22 Tue) falls within it. No text giving Sharad Purnima’s time was found; nishitha is Tithika’s convention.

Sharad Purnima: every date in Ipameri

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, 05:46 here. Trayodashi ended at 15:35 Sun, before it. Chaturdashi ends at 12:56, when the lead reaches 168°. The lead passed 0° at the new moon of 28 Sep, so the Moon is waxing: Shukla paksha.

The night of Sun 11 Oct ran from sunset 18:12 Sun to sunrise 05:46, 11 h 34 m. Cut into 15 muhurtas of 46 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 05:46 to 18:12, splits into 8 choghadiyas of 1 h 33 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 18:12 to 05:45 Tue, splits into 8 choghadiyas of 1 h 26 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′. Uttara Bhadrapada spans 333°20′–346°40′; the Moon entered its pada 2 at 336°40′. It leaves at 17:53, for Revati.

Add the Sun's and the Moon's places among the stars: 175.3° + 339.3° = 514.6°, one full turn and 154.6°. Past the turn, cut into 27 parts of 13°20′, it gives the yoga: 146°40′–160°00′ is the 12th, Dhruva. It ends at 14:03, then Vyaghata.

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 02:20, when the lead reached 162°; Vanija runs until 12:56.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 05:46 to 05:45 Tue, so the hours after midnight still belong to Somawara.

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, 27 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 28 Sep, 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: 4 Apr 1981, 17:19 Sat. Since then the Sun has moved 183.9° round the stars. Vikram Samvat numbers that year 2038; Shaka Samvat numbers it 1903.