Panchang in Codcod, Western Visayas, Philippines Fri 10 Apr 1964

Shiva’s Pradosh puja is done in pradosha, the 3 muhurtas after sunset. Trayodashi runs from 03:37 on Fri 10 Apr to 01:51 on Sat 11 Apr, so only Friday’s pradosha (17:57–20:18) 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, 05:39 here. Dwadashi ended at 03:37, before it. Trayodashi ends at 01:51 Sat, when the lead reaches 336°. The lead passed 180° at the full moon of 28 Mar, so the Moon is waning: Krishna paksha.

The night of Thu 9 Apr ran from sunset 17:57 Thu to sunrise 05:39, 11 h 42 m. Cut into 15 muhurtas of 46 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 05:39 to 17:57, splits into 8 choghadiyas of 1 h 32 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 17:57 to 05:38 Sat, splits into 8 choghadiyas of 1 h 27 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′. Purva Bhadrapada spans 320°00′–333°20′; the Moon entered its pada 1 at 320°. It leaves at 01:31 Sat, for Uttara Bhadrapada.

Add the Sun's and the Moon's places among the stars: 356.7° + 321.8° = 678.5°, one full turn and 318.5°. Past the turn, cut into 27 parts of 13°20′, it gives the yoga: 306°40′–320°00′ is the 24th, Shukla. It ends at 08:07, then Brahma.

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 14:49, when the lead reaches 330°; Vanija until 01:51 Sat.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 05:39 to 05:38 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 14 Mar 10:13 Sat to 12 Apr 20:37 Sun the Sun stayed in Meena, entering Mesha at 13 Apr 14:22 Mon, after the new moon. A month with no sankranti is Adhika Chaitra, before Chaitra 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 12 Apr, with the Sun in Meena, begins Chaitra (Adhik). Until then this Krishna paksha reads Chaitra (Adhik) here, and Chaitra (Adhik) in the amanta count.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 14 Mar 1964, 10:13 Sat. Since then the Sun has moved 26.5° round the stars. Vikram Samvat numbers that year 2021; Shaka Samvat numbers it 1886.