Panchang in Gresik, East Java, Indonesia Mon 20 Jun 2016

Purnima follows the tithi at sunrise. Purnima runs from 17:01 on Sun 19 Jun to 18:02 on Mon 20 Jun, so it holds sunrise only on Mon 20 Jun, at 05:39. No text giving Purnima’s time was found; sunrise is Tithika’s convention.

Purnima: every date in Gresik

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, 05:39 here. Chaturdashi ended at 17:01 Sun, before it. Purnima ends at 18:02, when the lead reaches 180°. The lead passed 0° at the new moon of 5 Jun, so the Moon is waxing: Shukla paksha.

The night of Sun 19 Jun ran from sunset 17:21 Sun to sunrise 05:39, 12 h 18 m. Cut into 15 muhurtas of 49 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 05:39 to 17:21, splits into 8 choghadiyas of 1 h 27 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 17:21 to 05:39 Tue, splits into 8 choghadiyas of 1 h 32 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 4 at 236°40′. It leaves at 07:35, for Mula.

Add the Sun's and the Moon's places among the stars: 65° + 239° = 304°. The sum, cut into 27 parts of 13°20′, gives the yoga: 293°20′–306°40′ is the 23rd, Shubha. It ends at 10:29, then Shukla.

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 05:35, when the lead reached 174°; Bava runs until 18:02.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 05:39 to 05:39 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: Vrishabha gives Jyeshtha. The Sun enters Mithuna on 15 Jun, inside the month. The next new moon, 4 Jul, 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 5 Jun, 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: 7 Apr 2016, 18:23 Thu. Since then the Sun has moved 71° round the stars. Vikram Samvat numbers that year 2073; Shaka Samvat numbers it 1938.