Panchang in Ipameri, Goiás, Brazil Thu 22 Jun 2017

Shiva’s worship centres on nishitha, the midnight muhurta. Chaturdashi runs from 07:08 on Thu 22 Jun to 03:20 on Fri 23 Jun, so only Thursday night’s nishitha (23:49–00:40 Fri) falls within it. No text giving Masik Shivratri’s time was found; nishitha is Tithika’s convention.

Masik Shivratri: every date in Ipameri

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, 06:42 here. Dwadashi ended at 10:44 Wed, before it. Trayodashi ends at 07:08, when the lead reaches 336°. The lead passed 180° at the full moon of 9 Jun, so the Moon is waning: Krishna paksha.

A day takes the tithi in force at its sunrise. Chaturdashi began at 07:08 and ended at 03:20 Fri, between the sunrises of 06:42 and 06:42 Fri. Thursday reads Trayodashi and Friday reads Amavasya: Chaturdashi is a kshaya tithi here.

The night of Wed 21 Jun ran from sunset 17:46 Wed to sunrise 06:42, 12 h 56 m. Cut into 15 muhurtas of 51 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 06:42 to 17:46, splits into 8 choghadiyas of 1 h 23 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 17:46 to 06:42 Fri, splits into 8 choghadiyas of 1 h 37 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′. Rohini spans 40°00′–53°20′; the Moon entered its pada 1 at 40°. It leaves at 23:18, for Mrigashira.

Add the Sun's and the Moon's places among the stars: 67.1° + 42.8° = 109.9°. The sum, cut into 27 parts of 13°20′, gives the yoga: 106°40′–120°00′ is the 9th, Shula. It ends at 21:44, then Ganda.

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 20:58 Wed, when the lead reached 330°; Vanija runs until 07:08.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 06:42 to 06:42 Fri, so the hours after midnight still belong to Guruwara.

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: Vrishabha gives Jyeshtha. The Sun enters Mithuna on 14 Jun, inside the month. The next new moon, 23 Jun, finds it in Mithuna and begins Ashadha.

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 23 Jun, with the Sun in Mithuna, begins Ashadha. Until then this Krishna paksha reads Ashadha here, and Jyeshtha in the amanta count.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 27 Mar 2017, 23:57 Mon. Since then the Sun has moved 83.6° round the stars. Vikram Samvat numbers that year 2074; Shaka Samvat numbers it 1939.