Panchang in Codcod, Western Visayas, Philippines Wed 21 Jun 2017

Shiva’s Pradosh puja is done in pradosha, the 3 muhurtas after sunset. Trayodashi runs from 21:44 on Wed 21 Jun to 18:08 on Thu 22 Jun, between the two evenings’ pradosha, touching neither. The Nirnayasindhu then takes the earlier day: Wed 21 Jun. No text giving Pradosh Vrat’s time was found; pradosha is Tithika’s convention.

Pradosh Vrat: every date in Codcod

The Moon gains on the Sun about 12° a day. Each 12° of lead is one tithi: 312°–324° is the 27th, Krishna Dwadashi. A day takes the tithi in force at its sunrise, 05:26 here. Ekadashi ended at 00:58, before it. Dwadashi ends at 21:44, when the lead reaches 324°. The lead passed 180° at the full moon of 9 Jun, so the Moon is waning: Krishna paksha.

The night of Tue 20 Jun ran from sunset 18:10 Tue to sunrise 05:26, 11 h 16 m. Cut into 15 muhurtas of 45 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 05:26 to 18:11, splits into 8 choghadiyas of 1 h 35 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 18:11 to 05:26 Thu, splits into 8 choghadiyas of 1 h 24 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′. Bharani spans 13°20′–26°40′; the Moon entered its pada 3 at 20°. It leaves at 15:56, for Krittika.

Add the Sun's and the Moon's places among the stars: 65.6° + 20.2° = 85.8°. The sum, cut into 27 parts of 13°20′, gives the yoga: 80°00′–93°20′ is the 7th, Sukarma. It ends at 16:53, then Dhriti.

A karana is half a tithi: 6° of the Moon's lead, so the first half of Dwadashi is Kaulava and the second Taitila. Kaulava runs until 11:25, when the lead reaches 318°; Taitila until 21:44.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 05:26 to 05:26 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: Vrishabha gives Jyeshtha. The Sun enters Mithuna on 15 Jun, inside the month. The next new moon, 24 Jun, finds it in Mithuna and begins Ashadha.

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 24 Jun, with the Sun in Mithuna, begins Ashadha. Until then this Krishna paksha reads Ashadha here, and Jyeshtha in the amanta count.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 28 Mar 2017, 10:57 Tue. Since then the Sun has moved 82.1° round the stars. Vikram Samvat numbers that year 2074; Shaka Samvat numbers it 1939.