Panchang in Ipameri, Goiás, Brazil Fri 31 Aug 2012

Purnima follows the tithi at sunrise. Purnima runs from 11:41 on Thu 30 Aug to 10:58 on Fri 31 Aug, so it holds sunrise only on Fri 31 Aug, at 06:20. 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, 06:20 here. Chaturdashi ended at 11:41 Thu, before it. Purnima ends at 10:58, when the lead reaches 180°. The lead passed 0° at the new moon of 17 Aug, so the Moon is waxing: Shukla paksha.

The night of Thu 30 Aug ran from sunset 18:05 Thu to sunrise 06:20, 12 h 15 m. Cut into 15 muhurtas of 49 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 06:20 to 18:05, 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 night here, 18:05 to 06:19 Sat, 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 fixed stars divide the Moon's path into 27 nakshatras of 13°20′, each in 4 padas of 3°20′. Shatabhisha spans 306°40′–320°00′; the Moon entered its pada 2 at 310°. It leaves at 20:57, for Purva Bhadrapada.

Add the Sun's and the Moon's places among the stars: 134.3° + 312° = 446.3°, one full turn and 86.3°. Past the turn, cut into 27 parts of 13°20′, it gives the yoga: 80°00′–93°20′ is the 7th, Sukarma. It ends at 18:14, then Dhriti.

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 ended at 23:16 Thu, when the lead reached 174°; Bava runs until 10:58.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 06:20 to 06:19 Sat, so the hours after midnight still belong to Shukrawara.

A month normally holds one sankranti, the Sun's entry into a new rashi. From 17 Aug 12:54 Fri to 15 Sep 23:10 Sat the Sun stayed in Simha, entering Kanya at 16 Sep 09:24 Sun, after the new moon. A month with no sankranti is Adhika Bhadrapada, before Bhadrapada 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 17 Aug, with the Sun in Simha, began Bhadrapada (Adhik). This Shukla paksha reads Bhadrapada (Adhik) in both counts.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 22 Mar 2012, 11:37 Thu. Since then the Sun has moved 156° round the stars. Vikram Samvat numbers that year 2069; Shaka Samvat numbers it 1934.