Panchang in Chahārbāgh, Alborz Province, Iran Sun 4 Jun 2023

Purnima follows the tithi at sunrise. Purnima runs from 09:17 on Sat 3 Jun to 07:11 on Sun 4 Jun, so it holds sunrise only on Sun 4 Jun, at 04:51. 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, 04:51 here. Chaturdashi ended at 09:17 Sat, before it. Purnima ends at 07:11, when the lead reaches 180°. The lead passed 0° at the new moon of 19 May, so the Moon is waxing: Shukla paksha.

A day takes the tithi in force at its sunrise. Pratipada began at 07:11 and ended at 04:39 Mon, between the sunrises of 04:51 and 04:51 Mon. Sunday reads Purnima and Monday reads Dwitiya: Pratipada is a kshaya tithi here.

The night of Sat 3 Jun ran from sunset 19:18 Sat to sunrise 04:51, 9 h 33 m. Cut into 15 muhurtas of 38 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 04:51 to 19:19, splits into 8 choghadiyas of 1 h 48 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 19:19 to 04:51 Mon, splits into 8 choghadiyas of 1 h 11 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′. Jyeshtha spans 226°40′–240°00′; the Moon entered its pada 1 at 226°40′. It leaves at 01:22 Mon, for Mula.

Add the Sun's and the Moon's places among the stars: 49° + 227.7° = 276.7°. The sum, cut into 27 parts of 13°20′, gives the yoga: 266°40′–280°00′ is the 21st, Siddha. It ends at 09:58, then Sadhya.

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 20:18 Sat, when the lead reached 174°; Bava runs until 07:11.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 04:51 to 04:51 Mon, so the hours after midnight still belong to Raviwara.

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 15 Jun, inside the month. The next new moon, 18 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 19 May, with the Sun in Vrishabha, began Jyeshtha. This Shukla paksha reads Jyeshtha in both counts.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 21 Mar 2023, 20:53 Tue. Since then the Sun has moved 72.4° round the stars. Vikram Samvat numbers that year 2080; Shaka Samvat numbers it 1945.