Panchang in Sevan, Gegharkunik, Armenia Mon 21 Mar 1921

Shiva’s Pradosh puja is done in pradosha, the 3 muhurtas after sunset. Trayodashi runs from 07:17 on Mon 21 Mar to 04:24 on Tue 22 Mar, so only Monday’s pradosha (18:10–20:32) 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, 06:03 here. Ekadashi ended at 10:12 Sun, before it. Dwadashi ends at 07:19, when the lead reaches 144°. The lead passed 0° at the new moon of 9 Mar, so the Moon is waxing: Shukla paksha.

A day takes the tithi in force at its sunrise. Trayodashi began at 07:19 and ended at 04:26 Tue, between the sunrises of 06:03 and 06:01 Tue. Monday reads Dwadashi and Tuesday reads Chaturdashi: Trayodashi is a kshaya tithi here.

The night of Sun 20 Mar ran from sunset 18:11 Sun to sunrise 06:03, 11 h 52 m. Cut into 15 muhurtas of 47 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 06:03 to 18:12, splits into 8 choghadiyas of 1 h 31 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 18:12 to 06:01 Tue, splits into 8 choghadiyas of 1 h 28 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′. Magha spans 120°00′–133°20′; the Moon entered its pada 1 at 120°. It leaves at 03:07 Tue, for Purva Phalguni.

Add the Sun's and the Moon's places among the stars: 337.2° + 120.5° = 457.7°, one full turn and 97.7°. Past the turn, cut into 27 parts of 13°20′, it gives the yoga: 93°20′–106°40′ is the 8th, Dhriti. It ends at 19:49, then Shula.

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 20:46 Sun, when the lead reached 138°; Balava runs until 07:19.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 06:03 to 06:01 Tue, so the hours after midnight still belong to Somawara.

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: Kumbha gives Phalguna. The Sun enters Meena on 14 Mar, inside the month. The next new moon, 8 Apr, finds it in Meena and begins Chaitra.

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 9 Mar, with the Sun in Kumbha, began Phalguna. This Shukla paksha reads Phalguna in both counts.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 20 Mar 1920, 13:55 Sat. Since then the Sun has moved 360.4° round the stars. Vikram Samvat numbers that year 1977; Shaka Samvat numbers it 1842.