Panchang in Ipameri, Goiás, Brazil Wed 21 Jun 2017

Shiva’s Pradosh puja is done in pradosha, the 3 muhurtas after sunset. Trayodashi runs from 10:44 on Wed 21 Jun to 07:08 on Thu 22 Jun, so only Wednesday’s pradosha (17:46–20:21) 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, 06:42 here. Ekadashi ended at 13:58 Tue, before it. Dwadashi ends at 10:44, when the lead reaches 324°. The lead passed 180° at the full moon of 9 Jun, so the Moon is waning: Krishna paksha.

The night of Tue 20 Jun ran from sunset 17:46 Tue to sunrise 06:42, 12 h 56 m. Cut into 15 muhurtas of 51 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 06:42 to 17:46, 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 night here, 17:46 to 06:42 Thu, splits into 8 choghadiyas of 1 h 37 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′. Krittika spans 26°40′–40°00′; the Moon entered its pada 1 at 26°40′. It leaves at 02:15 Thu, for Rohini.

Add the Sun's and the Moon's places among the stars: 66.1° + 27.8° = 93.9°. The sum, cut into 27 parts of 13°20′, gives the yoga: 93°20′–106°40′ is the 8th, Dhriti. It ends at 01:55 Thu, then Shula.

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 00:25, when the lead reached 318°; Taitila runs until 10:44.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 06:42 to 06:42 Thu, so the hours after midnight still belong to Budhawara.

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: Vrishabha gives Jyeshtha. The Sun enters Mithuna on 14 Jun, inside the month. The next new moon, 23 Jun, finds it in Mithuna and begins Ashadha.

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 23 Jun, with the Sun in Mithuna, begins Ashadha. Until then this Krishna paksha reads Ashadha here, and Jyeshtha in the amanta count.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 27 Mar 2017, 23:57 Mon. Since then the Sun has moved 82.6° round the stars. Vikram Samvat numbers that year 2074; Shaka Samvat numbers it 1939.