Panchang in Ipameri, Goiás, Brazil Fri 1 Feb 2019

Shiva’s Pradosh puja is done in pradosha, the 3 muhurtas after sunset. Trayodashi runs from 11:29 on Fri 1 Feb to 13:49 on Sat 2 Feb, so only Friday’s pradosha (19:52–22:06) 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: 312°–324° is the 27th, Krishna Dwadashi. A day takes the tithi in force at its sunrise, 07:00 here. Ekadashi ended at 09:32 Thu, before it. Dwadashi ends at 11:29, when the lead reaches 324°. The lead passed 180° at the full moon of 21 Jan, so the Moon is waning: Krishna paksha.

The night of Thu 31 Jan ran from sunset 19:52 Thu to sunrise 07:00, 11 h 8 m. Cut into 15 muhurtas of 44 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 07:00 to 19:52, splits into 8 choghadiyas of 1 h 36 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 19:52 to 07:00 Sat, splits into 8 choghadiyas of 1 h 23 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 13:37, for Purva Ashadha.

Add the Sun's and the Moon's places among the stars: 288.1° + 250° = 538.1°, one full turn and 178.1°. Past the turn, cut into 27 parts of 13°20′, it gives the yoga: 173°20′–186°40′ is the 14th, Harshana. It ends at 22:48, then Vajra.

A karana is half a tithi: 6° of the Moon's lead, so the first half of Dwadashi is Kaulava and the second Taitila. Kaulava ended at 22:27 Thu, when the lead reached 318°; Taitila runs until 11:29.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 07:00 to 07:00 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: Dhanu gives Pausha. The Sun enters Makara on 14 Jan, inside the month. The next new moon, 4 Feb, finds it in Makara and begins Magha.

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 4 Feb, with the Sun in Makara, begins Magha. Until then this Krishna paksha reads Magha here, and Pausha in the amanta count.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 17 Mar 2018, 10:11 Sat. Since then the Sun has moved 315.3° round the stars. Vikram Samvat numbers that year 2075; Shaka Samvat numbers it 1940.