Panchang in Sevan, Gegharkunik, Armenia Fri 12 Nov 1920

The tilak is applied in aparahna, the fourth fifth of the day. Dwitiya runs from 20:26 on Thu 11 Nov to 22:14 on Fri 12 Nov, so only Friday’s aparahna (12:42–14:43) falls within it. No text giving Bhai Dooj’s time was found; aparahna is Tithika’s convention.

Bhai Dooj: every date in Sevan

The Moon gains on the Sun about 12° a day. Each 12° of lead is one tithi: 12°–24° is the 2nd, Shukla Dwitiya. A day takes the tithi in force at its sunrise, 06:42 here. Pratipada ended at 20:28 Thu, before it. Dwitiya ends at 22:16, when the lead reaches 24°. The lead passed 0° at the new moon of 10 Nov, so the Moon is waxing: Shukla paksha.

The night of Thu 11 Nov ran from sunset 16:46 Thu to sunrise 06:42, 13 h 56 m. Cut into 15 muhurtas of 55 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 06:42 to 16:45, splits into 8 choghadiyas of 1 h 15 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 16:45 to 06:43 Sat, splits into 8 choghadiyas of 1 h 44 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′. Anuradha spans 213°20′–226°40′; the Moon entered its pada 4 at 223°20′. It leaves at 12:57, for Jyeshtha.

Add the Sun's and the Moon's places among the stars: 206.7° + 223.5° = 430.2°, one full turn and 70.2°. Past the turn, cut into 27 parts of 13°20′, it gives the yoga: 66°40′–80°00′ is the 6th, Atiganda. It ends at 00:36 Sat, then Sukarma.

A karana is half a tithi: 6° of the Moon's lead, so the first half of Dwitiya is Balava and the second Kaulava. Balava runs until 09:19, when the lead reaches 18°; Kaulava until 22:16.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 06:42 to 06:43 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 15 Nov, inside the month. The next new moon, 10 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 10 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: 20 Mar 1920, 13:55 Sat. Since then the Sun has moved 229.9° round the stars. Vikram Samvat numbers that year 1977; Shaka Samvat numbers it 1842.