Panchang in Mapleton, Utah, United States Tue 8 Dec 2015

Shiva’s Pradosh puja is done in pradosha, the 3 muhurtas after sunset. Trayodashi runs from 00:05 on Tue 8 Dec to 01:46 on Wed 9 Dec, so only Tuesday’s pradosha (17:00–19:55) falls within it. No text giving Pradosh Vrat’s time was found; pradosha is Tithika’s convention.

Pradosh Vrat: every date in Mapleton

The Moon gains on the Sun about 12° a day. Each 12° of lead is one tithi: 324°–336° is the 28th, Krishna Trayodashi. A day takes the tithi in force at its sunrise, 07:35 here. Dwadashi ended at 00:05, before it. Trayodashi ends at 01:46 Wed, when the lead reaches 336°. The lead passed 180° at the full moon of 25 Nov, so the Moon is waning: Krishna paksha.

A day takes the tithi in force at its sunrise.

New Delhi · IST

Sunrise here, 07:01, came before Dwadashi ended at 12:35: this day reads Dwadashi.

Mapleton · UTC−7

Sunrise here, 07:35, came after Dwadashi ended at 00:05: this day reads Trayodashi.

The night of Mon 7 Dec ran from sunset 17:00 Mon to sunrise 07:35, 14 h 35 m. Cut into 15 muhurtas of 58 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 07:35 to 17:00, splits into 8 choghadiyas of 1 h 10 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 17:00 to 07:36 Wed, splits into 8 choghadiyas of 1 h 49 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′. Swati spans 186°40′–200°00′; the Moon entered its pada 4 at 196°40′. It leaves at 08:25, for Vishakha.

Add the Sun's and the Moon's places among the stars: 232.1° + 199.6° = 431.7°, one full turn and 71.7°. Past the turn, cut into 27 parts of 13°20′, it gives the yoga: 66°40′–80°00′ is the 6th, Atiganda. It ends at 22:40, then Sukarma.

A karana is half a tithi: 6° of the Moon's lead, so the first half of Trayodashi is Garaja and the second Vanija. Garaja runs until 12:59, when the lead reaches 330°; Vanija until 01:46 Wed.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 07:35 to 07:36 Wed, so the hours after midnight still belong to Mangalawara.

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: Tula gives Kartika. The Sun enters Vrishchika on 16 Nov, inside the month. The next new moon, 11 Dec, finds it in Vrishchika and begins Margashirsha.

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 11 Dec, with the Sun in Vrishchika, begins Margashirsha. Until then this Krishna paksha reads Margashirsha here, and Kartika in the amanta count.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 20 Mar 2015, 03:36 Fri. Since then the Sun has moved 256.7° round the stars. Vikram Samvat numbers that year 2072; Shaka Samvat numbers it 1937.