Panchang in Chahārbāgh, Alborz Province, Iran Mon 19 Aug 2024

The rakhi is tied in aparahna, the fourth fifth of the day, outside bhadra. Purnima runs from 01:05 on Mon 19 Aug to 21:55 on Mon 19 Aug, so only Monday’s aparahna (13:30–16:10) falls within it. Every reading takes that day.

Raksha Bandhan: every date in Chahārbāgh

Purnima follows the tithi at sunrise. Purnima runs from 01:05 on Mon 19 Aug to 21:55 on Mon 19 Aug, so it holds sunrise only on Mon 19 Aug, at 05:28. 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, 05:28 here. Chaturdashi ended at 01:05, before it. Purnima ends at 21:55, when the lead reaches 180°. The lead passed 0° at the new moon of 4 Aug, so the Moon is waxing: Shukla paksha.

The night of Sun 18 Aug ran from sunset 18:52 Sun to sunrise 05:28, 10 h 36 m. Cut into 15 muhurtas of 42 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 05:28 to 18:51, splits into 8 choghadiyas of 1 h 40 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 18:51 to 05:29 Tue, splits into 8 choghadiyas of 1 h 19 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 4 at 290°. It leaves at 06:10, for Dhanishtha.

Add the Sun's and the Moon's places among the stars: 122.4° + 292.9° = 415.3°, one full turn and 55.3°. Past the turn, cut into 27 parts of 13°20′, it gives the yoga: 53°20′–66°40′ is the 5th, Shobhana. It ends at 22:46, then Atiganda.

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 runs until 11:32, when the lead reaches 174°; Bava until 21:55.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 05:28 to 05:29 Tue, so the hours after midnight still belong to Somawara.

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: Karka gives Shravana. The Sun enters Simha on 16 Aug, inside the month. The next new moon, 3 Sep, finds it in Simha and begins Bhadrapada.

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 4 Aug, with the Sun in Karka, began Shravana. This Shukla paksha reads Shravana in both counts.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 8 Apr 2024, 21:50 Mon. Since then the Sun has moved 127.2° round the stars. Vikram Samvat numbers that year 2081; Shaka Samvat numbers it 1946.