Panchang in Chahārbāgh, Alborz Province, Iran Sat 29 Jan 2022

Shiva’s Pradosh puja is done in pradosha, the 3 muhurtas after sunset. Trayodashi runs from 18:37 on Sat 29 Jan to 15:29 on Sun 30 Jan, so it touches only Saturday’s pradosha (17:30–20:14). No text giving Pradosh Vrat’s time was found; pradosha is Tithika’s convention.

Pradosh Vrat: every date in Chahārbāgh

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, 07:09 here. Ekadashi ended at 21:36 Fri, before it. Dwadashi ends at 18:37, when the lead reaches 324°. The lead passed 180° at the full moon of 18 Jan, so the Moon is waning: Krishna paksha.

The night of Fri 28 Jan ran from sunset 17:29 Fri to sunrise 07:09, 13 h 40 m. Cut into 15 muhurtas of 54 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 07:09 to 17:30, splits into 8 choghadiyas of 1 h 17 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 17:30 to 07:08 Sun, splits into 8 choghadiyas of 1 h 42 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′. Mula spans 240°00′–253°20′; the Moon entered its pada 1 at 240°. It leaves at 00:49 Sun, for Purva Ashadha.

Add the Sun's and the Moon's places among the stars: 285° + 242.5° = 527.5°, one full turn and 167.5°. 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 16:02, then Harshana.

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 08:08, when the lead reaches 318°; Taitila until 18:37.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 07:09 to 07:08 Sun, so the hours after midnight still belong to Shaniwara.

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, 1 Feb, 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 1 Feb, 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: 12 Apr 2021, 07:00 Mon. Since then the Sun has moved 286.7° round the stars. Vikram Samvat numbers that year 2078; Shaka Samvat numbers it 1943.