Panchang in Progreso, Yucatán, Mexico Wed 11 Jan 2017

Purnima follows the tithi at sunrise. Purnima begins at 08:21 on Wed 11 Jan, after that sunrise, and ends at 05:33 on Thu 12 Jan, before the next: it holds no sunrise. A tithi that holds no sunrise is kept on the day it is current: Wed 11 Jan. No text giving Purnima’s time was found; sunrise is Tithika’s convention.

Purnima: every date in Progreso

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, 06:38 here. Trayodashi ended at 11:24 Tue, before it. Chaturdashi ends at 08:21, when the lead reaches 168°. The lead passed 0° at the new moon of 29 Dec, so the Moon is waxing: Shukla paksha.

A day takes the tithi in force at its sunrise. Purnima began at 08:21 and ended at 05:33 Thu, between the sunrises of 06:38 and 06:38 Thu. Wednesday reads Chaturdashi and Thursday reads Pratipada: Purnima is a kshaya tithi here.

The night of Tue 10 Jan ran from sunset 17:34 Tue to sunrise 06:38, 13 h 4 m. Cut into 15 muhurtas of 52 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 06:38 to 17:35, splits into 8 choghadiyas of 1 h 22 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 17:35 to 06:38 Thu, splits into 8 choghadiyas of 1 h 37 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′. Ardra spans 66°40′–80°00′; the Moon entered its pada 3 at 73°20′. It leaves at 15:47, for Punarvasu.

Add the Sun's and the Moon's places among the stars: 267.4° + 74.4° = 341.8°. The sum, cut into 27 parts of 13°20′, gives the yoga: 333°20′–346°40′ is the 26th, Indra. It ends at 14:05, then Vaidhriti.

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 21:51 Tue, when the lead reached 162°; Vanija runs until 08:21.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 06:38 to 06:38 Thu, so the hours after midnight still belong to Budhawara.

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: Dhanu gives Pausha. The Sun enters Makara on 13 Jan, inside the month. The next new moon, 27 Jan, finds it in Makara and begins Magha.

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 29 Dec, with the Sun in Dhanu, began Pausha. This Shukla paksha reads Pausha in both counts.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 7 Apr 2016, 06:23 Thu. Since then the Sun has moved 273.4° round the stars. Vikram Samvat numbers that year 2073; Shaka Samvat numbers it 1938.