Panchang in Codcod, Western Visayas, Philippines Fri 12 Aug 1977

Shiva’s Pradosh puja is done in pradosha, the 3 muhurtas after sunset. Trayodashi runs from 03:48 on Fri 12 Aug to 05:12 on Sat 13 Aug, so only Friday’s pradosha (19:07–21:25) falls within it. 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: 324°–336° is the 28th, Krishna Trayodashi. A day takes the tithi in force at its sunrise, 06:37 here. Dwadashi ended at 03:48, before it. Trayodashi ends at 05:12 Sat, when the lead reaches 336°. The lead passed 180° at the full moon of 30 Jul, so the Moon is waning: Krishna paksha.

The night of Thu 11 Aug ran from sunset 19:07 Thu to sunrise 06:37, 11 h 30 m. Cut into 15 muhurtas of 46 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 06:37 to 19:07, splits into 8 choghadiyas of 1 h 33 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 19:07 to 06:37 Sat, splits into 8 choghadiyas of 1 h 26 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′. Punarvasu spans 80°00′–93°20′; the Moon entered its pada 1 at 80°. It leaves at 06:55 Sat, for Pushya.

Add the Sun's and the Moon's places among the stars: 115.5° + 80.9° = 196.4°. The sum, cut into 27 parts of 13°20′, gives the yoga: 186°40′–200°00′ is the 15th, Vajra. It ends at 13:10, then Siddhi.

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 16:33, when the lead reaches 330°; Vanija until 05:12 Sat.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 06:37 to 06:37 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 16 Jul 17:36 Sat to 15 Aug 06:31 Mon the Sun stayed in Karka, entering Simha at 16 Aug 22:07 Tue, after the new moon. A month with no sankranti is Adhika Shravana, before Shravana 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 15 Aug, with the Sun in Karka, begins Shravana (Adhik). Until then this Krishna paksha reads Shravana (Adhik) here, and Shravana (Adhik) in the amanta count.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 20 Mar 1977, 02:32 Sun. Since then the Sun has moved 140° round the stars. Vikram Samvat numbers that year 2034; Shaka Samvat numbers it 1899.