Panchang in Sevan, Gegharkunik, Armenia Mon 22 Oct 1979

The tilak is applied in aparahna, the fourth fifth of the day. Dwitiya runs from 07:34 on Mon 22 Oct to 08:19 on Tue 23 Oct, so only Monday’s aparahna (13:49–16:00) 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: 0°–12° is the 1st, Shukla Pratipada. A day takes the tithi in force at its sunrise, 07:17 here. Amavasya ended at 06:23 Sun, before it. Pratipada ends at 07:34, when the lead reaches 12°. The lead passed 0° at the new moon of 21 Oct, so the Moon is waxing: Shukla paksha.

A day takes the tithi in force at its sunrise. Pratipada began at 06:23 Sun, before sunrise at 07:16 Sun, and ends at 07:34, after the next sunrise at 07:17. Both days read Pratipada: it is a vriddhi tithi here.

The night of Sun 21 Oct ran from sunset 18:12 Sun to sunrise 07:17, 13 h 5 m. Cut into 15 muhurtas of 52 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 07:17 to 18:10, splits into 8 choghadiyas of 1 h 21 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 18:10 to 07:18 Tue, splits into 8 choghadiyas of 1 h 38 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′. Swati spans 186°40′–200°00′; the Moon entered its pada 3 at 193°20′. It leaves at 14:08, for Vishakha.

Add the Sun's and the Moon's places among the stars: 184.6° + 196.4° = 381°, one full turn and 21°. Past the turn, cut into 27 parts of 13°20′, it gives the yoga: 13°20′–26°40′ is the 2nd, Priti. It ends at 17:22, then Ayushmana.

A karana is half a tithi: 6° of the Moon's lead, so the first half of Pratipada is Kinstughna and the second Bava. Kinstughna ended at 19:02 Sun, when the lead reached 6°; Bava runs until 07:34.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 07:17 to 07:18 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: Tula gives Kartika. The Sun enters Vrishchika on 16 Nov, inside the month. The next new moon, 19 Nov, 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 21 Oct, 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: 28 Mar 1979, 06:59 Wed. Since then the Sun has moved 201.3° round the stars. Vikram Samvat numbers that year 2036; Shaka Samvat numbers it 1901.