Panchang in Pendleton, Oregon, United States Tue 24 Jul 2018

Shiva’s Pradosh puja is done in pradosha, the 3 muhurtas after sunset. Trayodashi runs from 05:55 on Tue 24 Jul to 08:15 on Wed 25 Jul, so only Tuesday’s pradosha (20:33–22:20) falls within it. No text giving Pradosh Vrat’s time was found; pradosha is Tithika’s convention.

Pradosh Vrat: every date in Pendleton

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, 05:29 here. Ekadashi ended at 03:53 Mon, before it. Dwadashi ends at 05:55, when the lead reaches 144°. The lead passed 0° at the new moon of 12 Jul, so the Moon is waxing: Shukla paksha.

A day takes the tithi in force at its sunrise. Dwadashi began at 03:53 Mon, before sunrise at 05:28 Mon, and ends at 05:55, after the next sunrise at 05:29. Both days read Dwadashi: it is a vriddhi tithi here.

The night of Mon 23 Jul ran from sunset 20:34 Mon to sunrise 05:29, 8 h 55 m. Cut into 15 muhurtas of 35 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 05:29 to 20:33, splits into 8 choghadiyas of 1 h 53 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 20:33 to 05:30 Wed, splits into 8 choghadiyas of 1 h 7 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 1 at 240°. It leaves at 05:51 Wed, for Purva Ashadha.

Add the Sun's and the Moon's places among the stars: 97.5° + 241.3° = 338.8°. The sum, cut into 27 parts of 13°20′, gives the yoga: 333°20′–346°40′ is the 26th, Indra. It ends at 20:19, then Vaidhriti.

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 16:52 Mon, when the lead reached 138°; Balava runs until 05:55.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 05:29 to 05:30 Wed, so the hours after midnight still belong to Mangalawara.

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: Mithuna gives Ashadha. The Sun enters Karka on 16 Jul, inside the month. The next new moon, 11 Aug, finds it in Karka and begins Shravana.

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 12 Jul, with the Sun in Mithuna, began Ashadha. This Shukla paksha reads Ashadha in both counts.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 17 Mar 2018, 06:11 Sat. Since then the Sun has moved 124.7° round the stars. Vikram Samvat numbers that year 2075; Shaka Samvat numbers it 1940.