Panchang in Codcod, Western Visayas, Philippines Sun 13 Oct 1985

The shraddha for all ancestors is done in aparahna, the fourth fifth of the day. Amavasya runs from 16:00 on Sun 13 Oct to 12:33 on Mon 14 Oct, between the two days’ aparahna, touching neither. The Nirnayasindhu then takes the earlier day: Sun 13 Oct. No text giving Sarva Pitru Amavasya’s time was found; aparahna is Tithika’s convention.

Sarva Pitru Amavasya: every date in Codcod

The Moon gains on the Sun about 12° a day. Each 12° of lead is one tithi: 336°–348° is the 29th, Krishna Chaturdashi. A day takes the tithi in force at its sunrise, 05:35 here. Trayodashi ended at 19:09 Sat, before it. Chaturdashi ends at 16:00, when the lead reaches 348°. The lead passed 180° at the full moon of 29 Sep, so the Moon is waning: Krishna paksha.

The night of Sat 12 Oct ran from sunset 17:31 Sat to sunrise 05:35, 12 h 4 m. Cut into 15 muhurtas of 48 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 05:35 to 17:31, splits into 8 choghadiyas of 1 h 29 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 17:31 to 05:35 Mon, splits into 8 choghadiyas of 1 h 30 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 Phalguni spans 146°40′–160°00′; the Moon entered its pada 4 at 156°40′. It leaves at 09:07, for Hasta.

Add the Sun's and the Moon's places among the stars: 175.8° + 157.8° = 333.6°. The sum, cut into 27 parts of 13°20′, gives the yoga: 333°20′–346°40′ is the 26th, Indra. It ends at 01:12 Mon, then Vaidhriti.

A karana is half a tithi: 6° of the Moon's lead, so the first half of Chaturdashi is Vishti and the second Shakuni. Vishti runs until 05:38, when the lead reaches 342°; Shakuni until 16:00.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 05:35 to 05:35 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: Simha gives Bhadrapada. The Sun enters Kanya on 16 Sep, inside the month. The next new moon, 14 Oct, finds it in Kanya and begins Ashwina.

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 14 Oct, with the Sun in Kanya, begins Ashwina. Until then this Krishna paksha reads Ashwina here, and Bhadrapada in the amanta count.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 21 Mar 1985, 19:58 Thu. Since then the Sun has moved 198.6° round the stars. Vikram Samvat numbers that year 2042; Shaka Samvat numbers it 1907.