Panchang in Sevan, Gegharkunik, Armenia Thu 25 Jan 1979

Shiva’s Pradosh puja is done in pradosha, the 3 muhurtas after sunset. Trayodashi runs from 21:02 on Thu 25 Jan to 17:46 on Fri 26 Jan, between the two evenings’ pradosha, touching neither. The Nirnayasindhu then takes the earlier day: Thu 25 Jan. 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, 08:16 here. Ekadashi ended at 23:47 Wed, before it. Dwadashi ends at 21:02, when the lead reaches 324°. The lead passed 180° at the full moon of 13 Jan, so the Moon is waning: Krishna paksha.

The night of Wed 24 Jan ran from sunset 18:07 Wed to sunrise 08:16, 14 h 9 m. Cut into 15 muhurtas of 56 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 08:16 to 18:08, splits into 8 choghadiyas of 1 h 14 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 18:08 to 08:15 Fri, splits into 8 choghadiyas of 1 h 45 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′. Jyeshtha spans 226°40′–240°00′; the Moon entered its pada 4 at 236°40′. It leaves at 11:56, for Mula.

Add the Sun's and the Moon's places among the stars: 281° + 237.8° = 518.8°, one full turn and 158.8°. 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 10:07, then Vyaghata.

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 10:29, when the lead reaches 318°; Taitila until 21:02.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 08:16 to 08:15 Fri, so the hours after midnight still belong to Guruwara.

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: Dhanu gives Pausha. The Sun enters Makara on 14 Jan, inside the month. The next new moon, 28 Jan, finds it in Makara and begins Magha.

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 28 Jan, with the Sun in Makara, begins Magha. Until then this Krishna paksha reads Magha here, and Pausha in the amanta count.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 7 Apr 1978, 19:15 Fri. Since then the Sun has moved 287.1° round the stars. Vikram Samvat numbers that year 2035; Shaka Samvat numbers it 1900.