Panchang in Sevan, Gegharkunik, Armenia Tue 12 Jun 2018

Shiva’s worship centres on nishitha, the midnight muhurta. Chaturdashi runs from 06:04 on Tue 12 Jun to 03:04 on Wed 13 Jun, so only Tuesday night’s nishitha (00:41 Wed–01:17 Wed) 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: 324°–336° is the 28th, Krishna Trayodashi. A day takes the tithi in force at its sunrise, 05:29 here. Dwadashi ended at 08:34 Mon, before it. Trayodashi ends at 06:04, when the lead reaches 336°. The lead passed 180° at the full moon of 29 May, so the Moon is waning: Krishna paksha.

A day takes the tithi in force at its sunrise. Chaturdashi began at 06:04 and ended at 03:04 Wed, between the sunrises of 05:29 and 05:28 Wed. Tuesday reads Trayodashi and Wednesday reads Amavasya: Chaturdashi is a kshaya tithi here.

The night of Mon 11 Jun ran from sunset 20:30 Mon to sunrise 05:29, 8 h 59 m. Cut into 15 muhurtas of 35 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 05:29 to 20:30, splits into 8 choghadiyas of 1 h 52 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 20:30 to 05:28 Wed, splits into 8 choghadiyas of 1 h 7 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′. Krittika spans 26°40′–40°00′; the Moon entered its pada 2 at 30°. It leaves at 17:36, for Rohini.

Add the Sun's and the Moon's places among the stars: 56.9° + 32.6° = 89.5°. The sum, cut into 27 parts of 13°20′, gives the yoga: 80°00′–93°20′ is the 7th, Sukarma. It ends at 11:18, then Dhriti.

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 ended at 19:23 Mon, when the lead reached 330°; Vanija runs until 06:04.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 05:29 to 05:28 Wed, so the hours after midnight still belong to Mangalawara.

A month normally holds one sankranti, the Sun's entry into a new rashi. From 15 May 15:47 Tue to 13 Jun 23:43 Wed the Sun stayed in Vrishabha, entering Mithuna at 15 Jun 10:06 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 13 Jun, with the Sun in Vrishabha, begins Jyeshtha (Adhik). Until then this Krishna paksha reads Jyeshtha (Adhik) here, and Jyeshtha (Adhik) in the amanta count.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 17 Mar 2018, 17:11 Sat. Since then the Sun has moved 84.1° round the stars. Vikram Samvat numbers that year 2075; Shaka Samvat numbers it 1940.