Panchang in Codcod, Western Visayas, Philippines Sat 28 Mar 1964

Purnima follows the tithi at sunrise. Purnima runs from 10:27 on Fri 27 Mar to 10:48 on Sat 28 Mar, so it holds sunrise only on Sat 28 Mar, at 05:46. 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, 05:46 here. Chaturdashi ended at 10:27 Fri, before it. Purnima ends at 10:48, when the lead reaches 180°. The lead passed 0° at the new moon of 14 Mar, so the Moon is waxing: Shukla paksha.

The night of Fri 27 Mar ran from sunset 17:57 Fri to sunrise 05:46, 11 h 49 m. Cut into 15 muhurtas of 47 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 05:46 to 17:57, splits into 8 choghadiyas of 1 h 31 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 17:57 to 05:46 Sun, splits into 8 choghadiyas of 1 h 28 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′. Hasta spans 160°00′–173°20′; the Moon entered its pada 1 at 160°. It leaves at 04:20 Sun, for Chitra.

Add the Sun's and the Moon's places among the stars: 343.9° + 161.4° = 505.3°, one full turn and 145.3°. Past the turn, cut into 27 parts of 13°20′, it gives the yoga: 133°20′–146°40′ is the 11th, Vriddhi. It ends at 08:06, then Dhruva.

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 22:34 Fri, when the lead reached 174°; Bava runs until 10:48.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 05:46 to 05:46 Sun, so the hours after midnight still belong to Shaniwara.

A month normally holds one sankranti, the Sun's entry into a new rashi. From 14 Mar 10:13 Sat to 12 Apr 20:37 Sun the Sun stayed in Meena, entering Mesha at 13 Apr 14:22 Mon, after the new moon. A month with no sankranti is Adhika Chaitra, before Chaitra itself.

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 Mar, with the Sun in Meena, began Chaitra (Adhik). This Shukla paksha reads Chaitra (Adhik) in both counts.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 14 Mar 1964, 10:13 Sat. Since then the Sun has moved 13.7° round the stars. Vikram Samvat numbers that year 2021; Shaka Samvat numbers it 1886.