Panchang in Ipameri, Goiás, Brazil Sun 30 Sep 1917

Purnima follows the tithi at sunrise. Purnima runs from 21:10 on Sat 29 Sep to 17:30 on Sun 30 Sep, so it holds sunrise only on Sun 30 Sep, at 05:56. No text giving Purnima’s time was found; sunrise is Tithika’s convention.

Purnima: every date in Ipameri

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, 05:56 here. Chaturdashi ended at 21:10 Sat, before it. Purnima ends at 17:30, when the lead reaches 180°. The lead passed 0° at the new moon of 16 Sep, so the Moon is waxing: Shukla paksha.

The night of Sat 29 Sep ran from sunset 18:09 Sat to sunrise 05:56, 11 h 47 m. Cut into 15 muhurtas of 47 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 05:56 to 18:09, splits into 8 choghadiyas of 1 h 31 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 18:09 to 05:55 Mon, splits into 8 choghadiyas of 1 h 28 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 21:09, for Revati.

Add the Sun's and the Moon's places among the stars: 163.9° + 337.1° = 501°, one full turn and 141°. Past the turn, cut into 27 parts of 13°20′, it gives the yoga: 133°20′–146°40′ is the 11th, Vriddhi. It ends at 14:23, then Dhruva.

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 07:19, when the lead reaches 174°; Bava until 17:30.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 05:56 to 05:55 Mon, so the hours after midnight still belong to Raviwara.

A month normally holds one sankranti, the Sun's entry into a new rashi. From 16 Sep 07:27 Sun to 15 Oct 23:40 Mon the Sun stayed in Kanya, entering Tula at 16 Oct 12:55 Tue, after the new moon. A month with no sankranti is Adhika Ashwina, before Ashwina 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 16 Sep, with the Sun in Kanya, began Ashwina (Adhik). This Shukla paksha reads Ashwina (Adhik) in both counts.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 23 Mar 1917, 01:04 Fri. Since then the Sun has moved 184.6° round the stars. Vikram Samvat numbers that year 1974; Shaka Samvat numbers it 1839.