Panchang in Ipameri, Goiás, Brazil Fri 9 Aug 1946

Shiva’s Pradosh puja is done in pradosha, the 3 muhurtas after sunset. Trayodashi began at 16:29 on Fri 9 Aug, before that evening’s pradosha, and ended at 18:01 on Sat 10 Aug, partway into the next. The Nirnayasindhu takes the evening Trayodashi fills: Fri 9 Aug. 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: 132°–144° is the 12th, Shukla Dwadashi. A day takes the tithi in force at its sunrise, 06:35 here. Ekadashi ended at 14:27 Thu, before it. Dwadashi ends at 16:29, when the lead reaches 144°. The lead passed 0° at the new moon of 28 Jul, so the Moon is waxing: Shukla paksha.

The night of Thu 8 Aug ran from sunset 18:00 Thu to sunrise 06:35, 12 h 35 m. Cut into 15 muhurtas of 50 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 06:35 to 18:01, splits into 8 choghadiyas of 1 h 25 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 18:01 to 06:35 Sat, splits into 8 choghadiyas of 1 h 34 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′. Mula spans 240°00′–253°20′; the Moon entered its pada 4 at 250°. It leaves at 08:15, for Purva Ashadha.

Add the Sun's and the Moon's places among the stars: 113.1° + 252.5° = 365.6°, one full turn and 5.6°. Past the turn, cut into 27 parts of 13°20′, it gives the yoga: 0°00′–13°20′ is the 1st, Vishkambha. It ends at 20:51, then Priti.

A karana is half a tithi: 6° of the Moon's lead, so the first half of Dwadashi is Bava and the second Balava. Bava ended at 03:31, when the lead reached 138°; Balava runs until 16:29.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 06:35 to 06:35 Sat, so the hours after midnight still belong to Shukrawara.

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: Karka gives Shravana. The Sun enters Simha on 16 Aug, inside the month. The next new moon, 26 Aug, finds it in Simha and begins Bhadrapada.

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 28 Jul, with the Sun in Karka, began Shravana. This Shukla paksha reads Shravana in both counts.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 2 Apr 1946, 01:37 Tue. Since then the Sun has moved 124.4° round the stars. Vikram Samvat numbers that year 2003; Shaka Samvat numbers it 1868.