Panchang in Myshkin, Yaroslavl Oblast, Russia Sat 15 Jul 2023

Shiva’s worship centres on nishitha, the midnight muhurta. Chaturdashi runs from 18:03 on Sat 15 Jul to 19:38 on Sun 16 Jul, so only Saturday night’s nishitha (00:19 Sun–00:45 Sun) falls within it. No text giving Masik Shivratri’s time was found; nishitha is Tithika’s convention.

Masik Shivratri: every date in Myshkin

The Moon gains on the Sun about 12° a day. Each 12° of lead is one tithi: 324°–336° is the 28th, Krishna Trayodashi. A day takes the tithi in force at its sunrise, 03:47 here. Dwadashi ended at 16:47 Fri, before it. Trayodashi ends at 18:03, when the lead reaches 336°. The lead passed 180° at the full moon of 3 Jul, so the Moon is waning: Krishna paksha.

The night of Fri 14 Jul ran from sunset 21:16 Fri to sunrise 03:47, 6 h 31 m. Cut into 15 muhurtas of 26 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 03:47 to 21:15, splits into 8 choghadiyas of 2 h 11 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 21:15 to 03:49 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′. Mrigashira spans 53°20′–66°40′; the Moon entered its pada 2 at 56°40′. It leaves at 21:53, for Ardra.

Add the Sun's and the Moon's places among the stars: 88.1° + 57.4° = 145.5°. The sum, cut into 27 parts of 13°20′, gives the yoga: 133°20′–146°40′ is the 11th, Vriddhi. It ends at 05:51, then Dhruva.

A karana is half a tithi: 6° of the Moon's lead, so the first half of Trayodashi is Garaja and the second Vanija. Garaja runs until 05:22, when the lead reaches 330°; Vanija until 18:03.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 03:47 to 03:49 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: Mithuna gives Ashadha. The Sun enters Karka on 17 Jul, inside the month. The next new moon, 17 Jul, finds it in Karka and begins Shravana.

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 17 Jul, with the Sun in Karka, begins Shravana. Until then this Krishna paksha reads Shravana here, and Ashadha in the amanta count.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 21 Mar 2023, 20:23 Tue. Since then the Sun has moved 111.5° round the stars. Vikram Samvat numbers that year 2080; Shaka Samvat numbers it 1945.