Panchang in Ipameri, Goiás, Brazil Fri 29 Jul 1966

Shiva’s Pradosh puja is done in pradosha, the 3 muhurtas after sunset. Trayodashi runs from 02:24 on Fri 29 Jul to 03:16 on Sat 30 Jul, so only Friday’s pradosha (17:58–20:30) 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, 06:40 here. Dwadashi ended at 02:24, before it. Trayodashi ends at 03:16 Sat, when the lead reaches 156°. The lead passed 0° at the new moon of 18 Jul, so the Moon is waxing: Shukla paksha.

A day takes the tithi in force at its sunrise.

New Delhi · IST

Sunrise here, 05:40, came before Dwadashi ended at 10:54: this day reads Dwadashi.

Ipameri · UTC−3

Sunrise here, 06:40, came after Dwadashi ended at 02:24: this day reads Trayodashi.

The night of Thu 28 Jul ran from sunset 17:57 Thu to sunrise 06:40, 12 h 43 m. Cut into 15 muhurtas of 50 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 06:40 to 17:58, 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 night here, 17:58 to 06:40 Sat, 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 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 3 at 246°40′. It leaves at 15:53, for Purva Ashadha.

Add the Sun's and the Moon's places among the stars: 102.4° + 248.5° = 350.9°. The sum, cut into 27 parts of 13°20′, gives the yoga: 346°40′–360°00′ is the 27th, Vaidhriti. It ends at 22:47, then Vishkambha.

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 14:48, when the lead reaches 150°; Taitila until 03:16 Sat.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 06:40 to 06:40 Sat, so the hours after midnight still belong to Shukrawara.

A month normally holds one sankranti, the Sun's entry into a new rashi. From 18 Jul 01:30 Mon to 16 Aug 08:47 Tue the Sun stayed in Karka, entering Simha at 16 Aug 14:28 Tue, after the new moon. A month with no sankranti is Adhika Shravana, before Shravana 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 18 Jul, with the Sun in Karka, began Shravana (Adhik). This Shukla paksha reads Shravana (Adhik) in both counts.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 22 Mar 1966, 01:46 Tue. Since then the Sun has moved 124.7° round the stars. Vikram Samvat numbers that year 2023; Shaka Samvat numbers it 1888.