Panchang in Codcod, Western Visayas, Philippines Tue 4 Aug 1925

The rakhi is tied in aparahna, the fourth fifth of the day, outside bhadra. Purnima runs from 23:42 on Mon 3 Aug to 19:58 on Tue 4 Aug, so only Tuesday’s aparahna (13:08–15:39) falls within it. Every reading takes that day.

Raksha Bandhan: every date in Codcod

Purnima follows the tithi at sunrise. Purnima runs from 23:42 on Mon 3 Aug to 19:58 on Tue 4 Aug, so it holds sunrise only on Tue 4 Aug, at 05:36. No text giving Purnima’s time was found; sunrise is Tithika’s convention.

Purnima: every date in Codcod

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, 05:36 here. Chaturdashi ended at 23:42 Mon, before it. Purnima ends at 19:58, when the lead reaches 180°. The lead passed 0° at the new moon of 21 Jul, so the Moon is waxing: Shukla paksha.

The night of Mon 3 Aug ran from sunset 18:10 Mon to sunrise 05:36, 11 h 26 m. Cut into 15 muhurtas of 45 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 05:36 to 18:10, splits into 8 choghadiyas of 1 h 34 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 18:10 to 05:36 Wed, splits into 8 choghadiyas of 1 h 25 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 06:07, for Shravana.

Add the Sun's and the Moon's places among the stars: 108.2° + 279.7° = 387.9°, one full turn and 27.9°. Past the turn, cut into 27 parts of 13°20′, it gives the yoga: 26°40′–40°00′ is the 3rd, Ayushmana. It ends at 23:42, then Saubhagya.

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 09:50, when the lead reaches 174°; Bava until 19:58.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 05:36 to 05:36 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: Karka gives Shravana. The Sun enters Simha on 16 Aug, inside the month. The next new moon, 19 Aug, 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 21 Jul, 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: 24 Mar 1925, 22:02 Tue. Since then the Sun has moved 127.6° round the stars. Vikram Samvat numbers that year 1982; Shaka Samvat numbers it 1847.