Panchang in Ipameri, Goiás, Brazil Mon 12 Apr 1915

Shiva’s worship centres on nishitha, the midnight muhurta. Chaturdashi runs from 05:23 on Mon 12 Apr to 06:49 on Tue 13 Apr, so only Monday night’s nishitha (23:49–00:38 Tue) 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: 336°–348° is the 29th, Krishna Chaturdashi. A day takes the tithi in force at its sunrise, 06:21 here. Trayodashi ended at 05:23, before it. Chaturdashi ends at 06:49 Tue, when the lead reaches 348°. The lead passed 180° at the full moon of 31 Mar, so the Moon is waning: Krishna paksha.

A day takes the tithi in force at its sunrise. Chaturdashi began at 05:23, before sunrise at 06:21, and ends at 06:49 Tue, after the next sunrise at 06:21 Tue. Both days read Chaturdashi: it is a vriddhi tithi here.

A day takes the tithi in force at its sunrise.

New Delhi · IST

Sunrise here, 06:00, came before Trayodashi ended at 13:53: this day reads Trayodashi.

Ipameri · UTC−3

Sunrise here, 06:21, came after Trayodashi ended at 05:23: this day reads Chaturdashi.

The night of Sun 11 Apr ran from sunset 18:07 Sun to sunrise 06:21, 12 h 14 m. Cut into 15 muhurtas of 48 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 06:21 to 18:06, splits into 8 choghadiyas of 1 h 28 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 18:06 to 06:21 Tue, splits into 8 choghadiyas of 1 h 31 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 04:46 Tue, for Revati.

Add the Sun's and the Moon's places among the stars: 358.7° + 335.2° = 693.9°, one full turn and 333.9°. Past the turn, cut into 27 parts of 13°20′, it gives the yoga: 333°20′–346°40′ is the 26th, Indra. It ends at 05:26 Tue, then Vaidhriti.

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 18:03, when the lead reaches 342°; Shakuni until 06:49 Tue.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 06:21 to 06:21 Tue, so the hours after midnight still belong to Somawara.

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, 14 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 14 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: 15 Mar 1915, 16:41 Mon. Since then the Sun has moved 27.2° round the stars. Vikram Samvat numbers that year 1972; Shaka Samvat numbers it 1837.