Panchang in Ipameri, Goiás, Brazil Wed 20 Apr 1955

Shiva’s worship centres on nishitha, the midnight muhurta. Chaturdashi runs from 16:22 on Wed 20 Apr to 13:25 on Thu 21 Apr, so only Wednesday night’s nishitha (23:47–00:36 Thu) 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, 06:22 here. Dwadashi ended at 18:46 Tue, before it. Trayodashi ends at 16:22, when the lead reaches 336°. The lead passed 180° at the full moon of 7 Apr, so the Moon is waning: Krishna paksha.

The night of Tue 19 Apr ran from sunset 18:01 Tue to sunrise 06:22, 12 h 21 m. Cut into 15 muhurtas of 49 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 06:22 to 18:00, splits into 8 choghadiyas of 1 h 27 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 18:00 to 06:23 Thu, splits into 8 choghadiyas of 1 h 32 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 2 at 336°40′. It leaves at 22:54, for Revati.

Add the Sun's and the Moon's places among the stars: 6.3° + 336.7° = 343°. The sum, cut into 27 parts of 13°20′, gives the yoga: 333°20′–346°40′ is the 26th, Indra. It ends at 12:07, then Vaidhriti.

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 05:38, when the lead reached 330°; Vanija runs until 16:22.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 06:22 to 06:23 Thu, so the hours after midnight still belong to Budhawara.

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: Meena gives Chaitra. The Sun enters Mesha on 13 Apr, inside the month. The next new moon, 22 Apr, finds it in Mesha and begins Vaishakha.

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 22 Apr, with the Sun in Mesha, begins Vaishakha. Until then this Krishna paksha reads Vaishakha here, and Chaitra in the amanta count.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 24 Mar 1955, 00:42 Thu. Since then the Sun has moved 26.8° round the stars. Vikram Samvat numbers that year 2012; Shaka Samvat numbers it 1877.