Panchang in Myshkin, Yaroslavl Oblast, Russia Sat 26 May 2018

Shiva’s Pradosh puja is done in pradosha, the 3 muhurtas after sunset. Trayodashi runs from 15:10 on Sat 26 May to 15:27 on Sun 27 May, so only Saturday’s pradosha (21:03–22:23) falls within it. No text giving Pradosh Vrat’s time was found; pradosha is Tithika’s convention.

Pradosh Vrat: every date in Myshkin

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, 03:43 here. Ekadashi ended at 15:17 Fri, before it. Dwadashi ends at 15:10, when the lead reaches 144°. The lead passed 0° at the new moon of 15 May, so the Moon is waxing: Shukla paksha.

The night of Fri 25 May ran from sunset 21:02 Fri to sunrise 03:43, 6 h 41 m. Cut into 15 muhurtas of 26 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 03:43 to 21:03, splits into 8 choghadiyas of 2 h 10 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 21:03 to 03:41 Sun, splits into 8 choghadiyas of 49 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′. Chitra spans 173°20′–186°40′; the Moon entered its pada 2 at 176°40′. It leaves at 18:06, for Swati.

Add the Sun's and the Moon's places among the stars: 40.6° + 178.9° = 219.5°. The sum, cut into 27 parts of 13°20′, gives the yoga: 213°20′–226°40′ is the 17th, Vyatipata. It ends at 16:00, then Variyana.

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 03:11, when the lead reached 138°; Balava runs until 15:10.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 03:43 to 03:41 Sun, so the hours after midnight still belong to Shaniwara.

A month normally holds one sankranti, the Sun's entry into a new rashi. From 15 May 14:47 Tue to 13 Jun 22:43 Wed the Sun stayed in Vrishabha, entering Mithuna at 15 Jun 09:06 Fri, after the new moon. A month with no sankranti is Adhika Jyeshtha, before Jyeshtha 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 15 May, with the Sun in Vrishabha, began Jyeshtha (Adhik). This Shukla paksha reads Jyeshtha (Adhik) in both counts.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 17 Mar 2018, 16:11 Sat. Since then the Sun has moved 67.8° round the stars. Vikram Samvat numbers that year 2075; Shaka Samvat numbers it 1940.