Panchang in Chahārbāgh, Alborz Province, Iran Sat 30 Aug 2031

Shiva’s Pradosh puja is done in pradosha, the 3 muhurtas after sunset. Trayodashi runs from 22:48 on Fri 29 Aug to 19:26 on Sat 30 Aug, so it touches only Saturday’s pradosha (18:37–20:49). No text giving Pradosh Vrat’s time was found; pradosha is Tithika’s convention.

Pradosh Vrat: every date in Chahārbāgh

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, 05:36 here. Dwadashi ended at 22:48 Fri, before it. Trayodashi ends at 19:26, when the lead reaches 156°. The lead passed 0° at the new moon of 18 Aug, so the Moon is waxing: Shukla paksha.

The night of Fri 29 Aug ran from sunset 18:39 Fri to sunrise 05:36, 10 h 57 m. Cut into 15 muhurtas of 43 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 05:36 to 18:37, 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 night here, 18:37 to 05:37 Sun, splits into 8 choghadiyas of 1 h 22 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′. Shravana spans 280°00′–293°20′; the Moon entered its pada 1 at 280°. It leaves at 02:43 Sun, for Dhanishtha.

Add the Sun's and the Moon's places among the stars: 132.2° + 280.2° = 412.4°, one full turn and 52.4°. Past the turn, cut into 27 parts of 13°20′, it gives the yoga: 40°00′–53°20′ is the 4th, Saubhagya. It ends at 06:58, then Shobhana.

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 09:08, when the lead reaches 150°; Taitila until 19:26.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 05:36 to 05:37 Sun, so the hours after midnight still belong to Shaniwara.

A month normally holds one sankranti, the Sun's entry into a new rashi. From 18 Aug 08:02 Mon to 16 Sep 22:16 Tue the Sun stayed in Simha, entering Kanya at 17 Sep 12:49 Wed, after the new moon. A month with no sankranti is Adhika Bhadrapada, before Bhadrapada 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 Aug, with the Sun in Simha, began Bhadrapada (Adhik). This Shukla paksha reads Bhadrapada (Adhik) in both counts.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 23 Mar 2031, 07:19 Sun. Since then the Sun has moved 154.2° round the stars. Vikram Samvat numbers that year 2088; Shaka Samvat numbers it 1953.