Panchang in Sevan, Gegharkunik, Armenia Wed 30 Oct 1963

Shiva’s Pradosh puja is done in pradosha, the 3 muhurtas after sunset. Trayodashi runs from 04:26 on Wed 30 Oct to 01:18 on Thu 31 Oct, so only Wednesday’s pradosha (18:00–20:41) falls within it. No text giving Pradosh Vrat’s time was found; pradosha is Tithika’s convention.

Pradosh Vrat: every date in Sevan

The Moon gains on the Sun about 12° a day. Each 12° of lead is one tithi: 144°–156° is the 13th, Shukla Trayodashi. A day takes the tithi in force at its sunrise, 07:26 here. Dwadashi ended at 04:26, before it. Trayodashi ends at 01:18 Thu, when the lead reaches 156°. The lead passed 0° at the new moon of 17 Oct, so the Moon is waxing: Shukla paksha.

The night of Tue 29 Oct ran from sunset 18:01 Tue to sunrise 07:26, 13 h 25 m. Cut into 15 muhurtas of 53 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 07:26 to 18:00, splits into 8 choghadiyas of 1 h 19 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 18:00 to 07:27 Thu, splits into 8 choghadiyas of 1 h 40 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′. Uttara Bhadrapada spans 333°20′–346°40′; the Moon entered its pada 2 at 336°40′. It leaves at 20:56, for Revati.

Add the Sun's and the Moon's places among the stars: 192.6° + 338.3° = 530.9°, one full turn and 170.9°. Past the turn, cut into 27 parts of 13°20′, it gives the yoga: 160°00′–173°20′ is the 13th, Vyaghata. It ends at 11:01, then Harshana.

A karana is half a tithi: 6° of the Moon's lead, so the first half of Trayodashi is Kaulava and the second Taitila. Kaulava runs until 14:56, when the lead reaches 150°; Taitila until 01:18 Thu.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 07:26 to 07:27 Thu, so the hours after midnight still belong to Budhawara.

A month normally holds one sankranti, the Sun's entry into a new rashi. From 17 Oct 16:42 Thu to 16 Nov 10:50 Sat the Sun stayed in Tula, entering Vrishchika at 16 Nov 14:39 Sat, after the new moon. A month with no sankranti is Adhika Kartika, before Kartika 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 17 Oct, with the Sun in Tula, began Kartika (Adhik). This Shukla paksha reads Kartika (Adhik) in both counts.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 25 Mar 1963, 16:09 Mon. Since then the Sun has moved 211.8° round the stars. Vikram Samvat numbers that year 2020; Shaka Samvat numbers it 1885.