Panchang in Davinópolis, Maranhão, Brazil Fri 16 Oct 1981

The Karwa Chauth fast is broken at moonrise. Chaturthi runs from 23:29 on Thu 15 Oct to 20:18 on Fri 16 Oct, between the two nights’ moonrise, touching neither. The Dharmasindhu then takes the later day: Fri 16 Oct.

Karwa Chauth: every date in Davinópolis

The Sankashti fast is broken at moonrise. Chaturthi runs from 23:29 on Thu 15 Oct to 20:18 on Fri 16 Oct, between the two nights’ moonrise, touching neither. The Dharmasindhu then takes the later day: Fri 16 Oct. No text giving Sankashti Chaturthi’s time was found; moonrise is Tithika’s convention.

Sankashti Chaturthi: every date in Davinópolis

The Moon gains on the Sun about 12° a day. Each 12° of lead is one tithi: 216°–228° is the 19th, Krishna Chaturthi. A day takes the tithi in force at its sunrise, 05:48 here. Tritiya ended at 23:29 Thu, before it. Chaturthi ends at 20:18, when the lead reaches 228°. The lead passed 180° at the full moon of 13 Oct, so the Moon is waning: Krishna paksha.

A day takes the tithi in force at its sunrise.

New Delhi · IST

Sunrise here, 06:22, came before Tritiya ended at 07:59: this day reads Tritiya. Chaturthi ends at 04:48 Sat, before the next sunrise, so no day here reads Chaturthi: it is kshaya.

Davinópolis · UTC−3

Sunrise here, 05:48, came after Tritiya ended at 23:29 Thu: this day reads Chaturthi.

The night of Thu 15 Oct ran from sunset 18:02 Thu to sunrise 05:48, 11 h 46 m. Cut into 15 muhurtas of 47 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 05:48 to 18:02, 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, 18:02 to 05:48 Sat, 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′. Krittika spans 26°40′–40°00′; the Moon entered its pada 4 at 36°40′. It leaves at 07:29, for Rohini.

Add the Sun's and the Moon's places among the stars: 179.3° + 39° = 218.3°. The sum, cut into 27 parts of 13°20′, gives the yoga: 213°20′–226°40′ is the 17th, Vyatipata. It ends at 18:34, then Variyana.

A karana is half a tithi: 6° of the Moon's lead, so the first half of Chaturthi is Bava and the second Balava. Bava runs until 09:51, when the lead reaches 222°; Balava until 20:18.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 05:48 to 05:48 Sat, so the hours after midnight still belong to Shukrawara.

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: Kanya gives Ashwina. The Sun enters Tula on 16 Oct, inside the month. The next new moon, 27 Oct, finds it in Tula and begins Kartika.

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 27 Oct, with the Sun in Tula, begins Kartika. Until then this Krishna paksha reads Kartika here, and Ashwina in the amanta count.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 4 Apr 1981, 17:19 Sat. Since then the Sun has moved 187.9° round the stars. Vikram Samvat numbers that year 2038; Shaka Samvat numbers it 1903.