Panchang in Davinópolis, Maranhão, Brazil Fri 13 Dec 1918

Gita Jayanti follows the tithi at sunrise. Ekadashi begins at 05:58 on Fri 13 Dec, after that sunrise, and ends at 03:17 on Sat 14 Dec, before the next: it holds no sunrise. A tithi that holds no sunrise is kept on the day it is current: Fri 13 Dec. No text giving Gita Jayanti’s time was found; sunrise is Tithika’s convention.

Gita Jayanti: every date in Davinópolis

Smartas test Ekadashi at sunrise. It begins at 05:58 on Fri 13 Dec, after that sunrise (05:50), and ends at 03:17 on Sat 14 Dec, before the next (05:50 Sat): it holds no sunrise. A kshaya Ekadashi is kept on the day it is current: Fri 13 Dec.

Mokshada Ekadashi: every date in Davinópolis

The Moon gains on the Sun about 12° a day. Each 12° of lead is one tithi: 108°–120° is the 10th, Shukla Dashami. A day takes the tithi in force at its sunrise, 05:50 here. Navami ended at 08:26 Thu, before it. Dashami ends at 05:58, when the lead reaches 120°. The lead passed 0° at the new moon of 3 Dec, so the Moon is waxing: Shukla paksha.

A day takes the tithi in force at its sunrise. Ekadashi began at 05:58 and ended at 03:17 Sat, between the sunrises of 05:50 and 05:50 Sat. Friday reads Dashami and Saturday reads Dwadashi: Ekadashi is a kshaya tithi here.

The night of Thu 12 Dec ran from sunset 18:16 Thu to sunrise 05:50, 11 h 34 m. Cut into 15 muhurtas of 46 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 05:50 to 18:16, splits into 8 choghadiyas of 1 h 33 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 18:16 to 05:50 Sat, splits into 8 choghadiyas of 1 h 26 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′. Revati spans 346°40′–360°00′; the Moon entered its pada 4 at 356°40′. It leaves at 09:34, for Ashwini.

Add the Sun's and the Moon's places among the stars: 237.8° + 357.7° = 595.5°, one full turn and 235.5°. Past the turn, cut into 27 parts of 13°20′, it gives the yoga: 226°40′–240°00′ is the 18th, Variyana. It ends at 12:42, then Parigha.

A karana is half a tithi: 6° of the Moon's lead, so the first half of Dashami is Taitila and the second Garaja. Taitila ended at 19:14 Thu, when the lead reached 114°; Garaja runs until 05:58.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 05:50 to 05:50 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: Vrishchika gives Margashirsha. The Sun enters Dhanu on 15 Dec, inside the month. The next new moon, 2 Jan, finds it in Dhanu and begins Pausha.

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 Dec, with the Sun in Vrishchika, began Margashirsha. This Shukla paksha reads Margashirsha in both counts.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 11 Apr 1918, 01:33 Thu. Since then the Sun has moved 240° round the stars. Vikram Samvat numbers that year 1975; Shaka Samvat numbers it 1840.