Panchang in Sevan, Gegharkunik, Armenia Sat 10 Apr 2021

Shiva’s worship centres on nishitha, the midnight muhurta. Chaturdashi runs from 02:58 on Sat 10 Apr to 04:33 on Sun 11 Apr, so only Saturday night’s nishitha (00:39 Sun–01:22 Sun) falls within it. No text giving Masik Shivratri’s time was found; nishitha is Tithika’s convention.

Masik Shivratri: every date in Sevan

The Moon gains on the Sun about 12° a day. Each 12° of lead is one tithi: 336°–348° is the 29th, Krishna Chaturdashi. A day takes the tithi in force at its sunrise, 06:29 here. Trayodashi ended at 02:58, before it. Chaturdashi ends at 04:33 Sun, when the lead reaches 348°. The lead passed 180° at the full moon of 28 Mar, so the Moon is waning: Krishna paksha.

The night of Fri 9 Apr ran from sunset 19:32 Fri to sunrise 06:29, 10 h 57 m. Cut into 15 muhurtas of 43 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 06:29 to 19:33, splits into 8 choghadiyas of 1 h 38 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 19:33 to 06:27 Sun, splits into 8 choghadiyas of 1 h 21 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 1 at 333°20′. It leaves at 07:27 Sun, for Revati.

Add the Sun's and the Moon's places among the stars: 356.3° + 334° = 690.3°, one full turn and 330.3°. Past the turn, cut into 27 parts of 13°20′, it gives the yoga: 320°00′–333°20′ is the 25th, Brahma. It ends at 12:03, then Indra.

A karana is half a tithi: 6° of the Moon's lead, so the first half of Chaturdashi is Vishti and the second Shakuni. Vishti runs until 15:43, when the lead reaches 342°; Shakuni until 04:33 Sun.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 06:29 to 06:27 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: Kumbha gives Phalguna. The Sun enters Meena on 14 Mar, inside the month. The next new moon, 12 Apr, finds it in Meena and begins Chaitra.

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 12 Apr, with the Sun in Meena, begins Chaitra. Until then this Krishna paksha reads Chaitra here, and Phalguna in the amanta count.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 24 Mar 2020, 13:28 Tue. Since then the Sun has moved 376.2° round the stars. Vikram Samvat numbers that year 2077; Shaka Samvat numbers it 1942.