Panchang in Ipameri, Goiás, Brazil Thu 11 Feb 1915

Shiva’s Pradosh puja is done in pradosha, the 3 muhurtas after sunset. Trayodashi runs from 05:01 on Thu 11 Feb to 03:28 on Fri 12 Feb, so only Thursday’s pradosha (18:49–21:04) falls within it. No text giving Pradosh Vrat’s time was found; pradosha is Tithika’s convention.

Pradosh Vrat: 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, 06:04 here. Dwadashi ended at 05:01, before it. Trayodashi ends at 03:28 Fri, when the lead reaches 336°. The lead passed 180° at the full moon of 31 Jan, so the Moon is waning: Krishna paksha.

A day takes the tithi in force at its sunrise.

New Delhi · IST

Sunrise here, 07:03, came before Dwadashi ended at 13:31: this day reads Dwadashi.

Ipameri · UTC−3

Sunrise here, 06:04, came after Dwadashi ended at 05:01: this day reads Trayodashi.

The night of Wed 10 Feb ran from sunset 18:49 Wed to sunrise 06:04, 11 h 15 m. Cut into 15 muhurtas of 45 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 06:04 to 18:49, splits into 8 choghadiyas of 1 h 35 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 18:49 to 06:05 Fri, splits into 8 choghadiyas of 1 h 24 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′. Purva Ashadha spans 253°20′–266°40′; the Moon entered its pada 4 at 263°20′. It leaves at 11:37, for Uttara Ashadha.

Add the Sun's and the Moon's places among the stars: 298.9° + 263.5° = 562.4°, one full turn and 202.4°. Past the turn, cut into 27 parts of 13°20′, it gives the yoga: 200°00′–213°20′ is the 16th, Siddhi. It ends at 23:48, then Vyatipata.

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 runs until 16:12, when the lead reaches 330°; Vanija until 03:28 Fri.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 06:04 to 06:05 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: Makara gives Magha. The Sun enters Kumbha on 12 Feb, inside the month. The next new moon, 14 Feb, finds it in Kumbha and begins Phalguna.

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 Feb, with the Sun in Kumbha, begins Phalguna. Until then this Krishna paksha reads Phalguna here, and Magha in the amanta count.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 26 Mar 1914, 15:08 Thu. Since then the Sun has moved 316.3° round the stars. Vikram Samvat numbers that year 1971; Shaka Samvat numbers it 1836.