Panchang in Davinópolis, Maranhão, Brazil Fri 8 Nov 2013

The evening arghya is offered at sunset. Shashthi runs from 20:42 on Thu 7 Nov to 18:11 on Fri 8 Nov, so it holds sunset only on Fri 8 Nov, at 18:03. No text giving Chhath · Sandhya Arghya’s time was found; sunset is Tithika’s convention.

Chhath: every date in Davinópolis

The Moon gains on the Sun about 12° a day. Each 12° of lead is one tithi: 60°–72° is the 6th, Shukla Shashthi. A day takes the tithi in force at its sunrise, 05:43 here. Panchami ended at 20:42 Thu, before it. Shashthi ends at 18:11, when the lead reaches 72°. The lead passed 0° at the new moon of 3 Nov, so the Moon is waxing: Shukla paksha.

The night of Thu 7 Nov ran from sunset 18:03 Thu to sunrise 05:43, 11 h 40 m. Cut into 15 muhurtas of 46 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 05:43 to 18:03, 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 night here, 18:03 to 05:43 Sat, 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 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 1 at 266°40′. It leaves at 03:18 Sat, for Shravana.

Add the Sun's and the Moon's places among the stars: 202.1° + 267.1° = 469.2°, one full turn and 109.2°. Past the turn, cut into 27 parts of 13°20′, it gives the yoga: 106°40′–120°00′ is the 9th, Shula. It ends at 22:39, then Ganda.

A karana is half a tithi: 6° of the Moon's lead, so the first half of Shashthi is Kaulava and the second Taitila. Kaulava runs until 07:25, when the lead reaches 66°; Taitila until 18:11.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 05:43 to 05:43 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: Tula gives Kartika. The Sun enters Vrishchika on 16 Nov, inside the month. The next new moon, 2 Dec, finds it in Vrishchika and begins Margashirsha.

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 3 Nov, with the Sun in Tula, began Kartika. This Shukla paksha reads Kartika in both counts.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 10 Apr 2013, 06:35 Wed. Since then the Sun has moved 205.5° round the stars. Vikram Samvat numbers that year 2070; Shaka Samvat numbers it 1935.