Panchang in Ipameri, Goiás, Brazil Mon 20 Dec 2010

Purnima follows the tithi at sunrise. Purnima begins at 07:18 on Mon 20 Dec, after that sunrise, and ends at 06:13 on Tue 21 Dec, before the next: it holds no sunrise. A tithi that holds no sunrise is kept on the day it is current: Mon 20 Dec. 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: 156°–168° is the 14th, Shukla Chaturdashi. A day takes the tithi in force at its sunrise, 06:34 here. Trayodashi ended at 07:49 Sun, before it. Chaturdashi ends at 07:18, when the lead reaches 168°. The lead passed 0° at the new moon of 5 Dec, so the Moon is waxing: Shukla paksha.

A day takes the tithi in force at its sunrise. Purnima began at 07:18 and ended at 06:13 Tue, between the sunrises of 06:34 and 06:35 Tue. Monday reads Chaturdashi and Tuesday reads Pratipada: Purnima is a kshaya tithi here.

The night of Sun 19 Dec ran from sunset 19:45 Sun to sunrise 06:34, 10 h 49 m. Cut into 15 muhurtas of 43 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 06:34 to 19:46, splits into 8 choghadiyas of 1 h 39 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 19:46 to 06:35 Tue, splits into 8 choghadiyas of 1 h 21 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′. Rohini spans 40°00′–53°20′; the Moon entered its pada 4 at 50°. It leaves at 09:02, for Mrigashira.

Add the Sun's and the Moon's places among the stars: 244.3° + 52° = 296.3°. The sum, cut into 27 parts of 13°20′, gives the yoga: 293°20′–306°40′ is the 23rd, Shubha. It ends at 23:42, then Shukla.

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 19:38 Sun, when the lead reached 162°; Vanija runs until 07:18.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 06:34 to 06:35 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: Vrishchika gives Margashirsha. The Sun enters Dhanu on 16 Dec, inside the month. The next new moon, 4 Jan, finds it in Dhanu and begins Pausha.

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 5 Dec, with the Sun in Vrishchika, began Margashirsha. This Shukla paksha reads Margashirsha in both counts.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 15 Mar 2010, 18:01 Mon. Since then the Sun has moved 273.1° round the stars. Vikram Samvat numbers that year 2067; Shaka Samvat numbers it 1932.