Panchang in Chahārbāgh, Alborz Province, Iran Sat 24 Jul 2021

Guru Purnima follows the tithi at sunrise. Purnima runs from 09:43 on Fri 23 Jul to 07:06 on Sat 24 Jul, so it holds sunrise only on Sat 24 Jul, at 06:08. No text giving Guru Purnima’s time was found; sunrise is Tithika’s convention.

Guru Purnima: every date in Chahārbāgh

Purnima follows the tithi at sunrise. Purnima runs from 09:43 on Fri 23 Jul to 07:06 on Sat 24 Jul, so it holds sunrise only on Sat 24 Jul, at 06:08. No text giving Purnima’s time was found; sunrise is Tithika’s convention.

Purnima: every date in Chahārbāgh

The Moon gains on the Sun about 12° a day. Each 12° of lead is one tithi: 168°–180° is the 15th, Shukla Purnima. A day takes the tithi in force at its sunrise, 06:08 here. Chaturdashi ended at 09:43 Fri, before it. Purnima ends at 07:06, when the lead reaches 180°. The lead passed 0° at the new moon of 10 Jul, so the Moon is waxing: Shukla paksha.

A day takes the tithi in force at its sunrise. Pratipada began at 07:06 and ended at 04:50 Sun, between the sunrises of 06:08 and 06:09 Sun. Saturday reads Purnima and Sunday reads Dwitiya: Pratipada is a kshaya tithi here.

The night of Fri 23 Jul ran from sunset 20:18 Fri to sunrise 06:08, 9 h 50 m. Cut into 15 muhurtas of 39 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 06:08 to 20:17, splits into 8 choghadiyas of 1 h 46 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 20:17 to 06:09 Sun, splits into 8 choghadiyas of 1 h 14 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′. Uttara Ashadha spans 266°40′–280°00′; the Moon entered its pada 4 at 276°40′. It leaves at 11:40, for Shravana.

Add the Sun's and the Moon's places among the stars: 97.2° + 276.7° = 373.9°, one full turn and 13.9°. Past the turn, cut into 27 parts of 13°20′, it gives the yoga: 13°20′–26°40′ is the 2nd, Priti. It ends at 02:14 Sun, then Ayushmana.

A karana is half a tithi: 6° of the Moon's lead, so the first half of Purnima is Vishti and the second Bava. Vishti ended at 20:23 Fri, when the lead reached 174°; Bava runs until 07:06.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 06:08 to 06:09 Sun, so the hours after midnight still belong to Shaniwara.

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, 8 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 10 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: 12 Apr 2021, 07:00 Mon. Since then the Sun has moved 98.9° round the stars. Vikram Samvat numbers that year 2078; Shaka Samvat numbers it 1943.