Panchang in Sevan, Gegharkunik, Armenia Fri 23 Oct 1931

Shiva’s Pradosh puja is done in pradosha, the 3 muhurtas after sunset. Trayodashi runs from 08:48 on Fri 23 Oct to 11:30 on Sat 24 Oct, so only Friday’s pradosha (17:10–19:47) 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: 132°–144° is the 12th, Shukla Dwadashi. A day takes the tithi in force at its sunrise, 06:18 here. Ekadashi ended at 06:12 Thu, before it. Dwadashi ends at 08:48, when the lead reaches 144°. The lead passed 0° at the new moon of 11 Oct, so the Moon is waxing: Shukla paksha.

A day takes the tithi in force at its sunrise. Dwadashi began at 06:12 Thu, before sunrise at 06:17 Thu, and ends at 08:48, after the next sunrise at 06:18. Both days read Dwadashi: it is a vriddhi tithi here.

The night of Thu 22 Oct ran from sunset 17:11 Thu to sunrise 06:18, 13 h 7 m. Cut into 15 muhurtas of 52 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 06:18 to 17:10, splits into 8 choghadiyas of 1 h 21 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 17:10 to 06:19 Sat, splits into 8 choghadiyas of 1 h 38 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 3 at 326°40′. It leaves at 15:41, for Uttara Bhadrapada.

Add the Sun's and the Moon's places among the stars: 185.9° + 328.7° = 514.6°, one full turn and 154.6°. Past the turn, cut into 27 parts of 13°20′, it gives the yoga: 146°40′–160°00′ is the 12th, Dhruva. It ends at 16:28, then Vyaghata.

A karana is half a tithi: 6° of the Moon's lead, so the first half of Dwadashi is Bava and the second Balava. Bava ended at 19:29 Thu, when the lead reached 138°; Balava runs until 08:48.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 06:18 to 06:19 Sat, so the hours after midnight still belong to Shukrawara.

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: Kanya gives Ashwina. The Sun enters Tula on 17 Oct, inside the month. The next new moon, 10 Nov, finds it in Tula and begins Kartika.

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 Oct, with the Sun in Kanya, began Ashwina. This Shukla paksha reads Ashwina in both counts.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 19 Mar 1931, 10:50 Thu. Since then the Sun has moved 211° round the stars. Vikram Samvat numbers that year 1988; Shaka Samvat numbers it 1853.