Panchang in Ipameri, Goiás, Brazil Thu 30 Sep 1982

Shiva’s Pradosh puja is done in pradosha, the 3 muhurtas after sunset. Trayodashi runs from 22:22 on Wed 29 Sep to 22:56 on Thu 30 Sep, so only Thursday’s pradosha (18:09–20:31) 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: 144°–156° is the 13th, Shukla Trayodashi. A day takes the tithi in force at its sunrise, 05:55 here. Dwadashi ended at 22:22 Wed, before it. Trayodashi ends at 22:56, when the lead reaches 156°. The lead passed 0° at the new moon of 17 Sep, so the Moon is waxing: Shukla paksha.

A day takes the tithi in force at its sunrise.

New Delhi · IST

Sunrise here, 06:13, came before Dwadashi ended at 06:52: this day reads Dwadashi.

Ipameri · UTC−3

Sunrise here, 05:55, came after Dwadashi ended at 22:22 Wed: this day reads Trayodashi.

The night of Wed 29 Sep ran from sunset 18:09 Wed to sunrise 05:55, 11 h 46 m. Cut into 15 muhurtas of 47 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 05:55 to 18:09, 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 night here, 18:09 to 05:55 Fri, 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 fixed stars divide the Moon's path into 27 nakshatras of 13°20′, each in 4 padas of 3°20′. Shatabhisha spans 306°40′–320°00′; the Moon entered its pada 2 at 310°. It leaves at 23:00, for Purva Bhadrapada.

Add the Sun's and the Moon's places among the stars: 163.3° + 310.9° = 474.2°, one full turn and 114.2°. Past the turn, cut into 27 parts of 13°20′, it gives the yoga: 106°40′–120°00′ is the 9th, Shula. It ends at 16:08, then Ganda.

A karana is half a tithi: 6° of the Moon's lead, so the first half of Trayodashi is Kaulava and the second Taitila. Kaulava runs until 10:44, when the lead reaches 150°; Taitila until 22:56.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 05:55 to 05:55 Fri, so the hours after midnight still belong to Guruwara.

A month normally holds one sankranti, the Sun's entry into a new rashi. From 17 Sep 09:09 Fri to 16 Oct 21:04 Sat the Sun stayed in Kanya, entering Tula at 17 Oct 04:46 Sun, after the new moon. A month with no sankranti is Adhika Ashwina, before Ashwina 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 17 Sep, with the Sun in Kanya, began Ashwina (Adhik). This Shukla paksha reads Ashwina (Adhik) in both counts.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 25 Mar 1982, 07:17 Thu. Since then the Sun has moved 182.5° round the stars. Vikram Samvat numbers that year 2039; Shaka Samvat numbers it 1904.