Panchang in Sevan, Gegharkunik, Armenia Sun 10 May 1953

Shiva’s Pradosh puja is done in pradosha, the 3 muhurtas after sunset. Trayodashi runs from 16:08 on Sun 10 May to 13:17 on Mon 11 May, so only Sunday’s pradosha (19:04–21:00) 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: 312°–324° is the 27th, Krishna Dwadashi. A day takes the tithi in force at its sunrise, 04:49 here. Ekadashi ended at 18:59 Sat, before it. Dwadashi ends at 16:08, when the lead reaches 324°. The lead passed 180° at the full moon of 29 Apr, so the Moon is waning: Krishna paksha.

The night of Sat 9 May ran from sunset 19:03 Sat to sunrise 04:49, 9 h 46 m. Cut into 15 muhurtas of 39 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 04:49 to 19:04, splits into 8 choghadiyas of 1 h 46 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 19:04 to 04:47 Mon, splits into 8 choghadiyas of 1 h 12 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 4 at 343°20′. It leaves at 10:04, for Revati.

Add the Sun's and the Moon's places among the stars: 25.9° + 343.5° = 369.4°, one full turn and 9.4°. Past the turn, cut into 27 parts of 13°20′, it gives the yoga: 0°00′–13°20′ is the 1st, Vishkambha. It ends at 10:56, then Priti.

A karana is half a tithi: 6° of the Moon's lead, so the first half of Dwadashi is Kaulava and the second Taitila. Kaulava runs until 05:34, when the lead reaches 318°; Taitila until 16:08.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 04:49 to 04:47 Mon, so the hours after midnight still belong to Raviwara.

A month normally holds one sankranti, the Sun's entry into a new rashi. From 13 Apr 23:08 Mon to 13 May 08:05 Wed the Sun stayed in Mesha, entering Vrishabha at 14 May 10:41 Thu, after the new moon. A month with no sankranti is Adhika Vaishakha, before Vaishakha 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 13 May, with the Sun in Mesha, begins Vaishakha (Adhik). Until then this Krishna paksha reads Vaishakha (Adhik) here, and Vaishakha (Adhik) in the amanta count.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 15 Mar 1953, 14:04 Sun. Since then the Sun has moved 54.5° round the stars. Vikram Samvat numbers that year 2010; Shaka Samvat numbers it 1875.