Panchang in Sevan, Gegharkunik, Armenia Thu 17 Aug 1978

The rakhi is tied in aparahna, the fourth fifth of the day, outside bhadra. Purnima runs from 17:47 on Thu 17 Aug to 14:13 on Fri 18 Aug, between the two days’ aparahna, touching neither. The Nirnayasindhu then takes the earlier day: Thu 17 Aug.

Raksha Bandhan: every date in Sevan

The Moon gains on the Sun about 12° a day. Each 12° of lead is one tithi: 156°–168° is the 14th, Shukla Chaturdashi. A day takes the tithi in force at its sunrise, 06:11 here. Trayodashi ended at 21:25 Wed, before it. Chaturdashi ends at 17:47, when the lead reaches 168°. The lead passed 0° at the new moon of 4 Aug, so the Moon is waxing: Shukla paksha.

The night of Wed 16 Aug ran from sunset 19:57 Wed to sunrise 06:11, 10 h 14 m. Cut into 15 muhurtas of 40 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 06:11 to 19:55, splits into 8 choghadiyas of 1 h 43 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 19:55 to 06:12 Fri, splits into 8 choghadiyas of 1 h 17 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′. Shravana spans 280°00′–293°20′; the Moon entered its pada 1 at 280°. It leaves at 01:05 Fri, for Dhanishtha.

Add the Sun's and the Moon's places among the stars: 120.3° + 281.4° = 401.7°, one full turn and 41.7°. Past the turn, cut into 27 parts of 13°20′, it gives the yoga: 40°00′–53°20′ is the 4th, Saubhagya. It ends at 23:32, then Shobhana.

A karana is half a tithi: 6° of the Moon's lead, so the first half of Chaturdashi is Garaja and the second Vanija. Garaja runs until 07:36, when the lead reaches 162°; Vanija until 17:47.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 06:11 to 06:12 Fri, so the hours after midnight still belong to Guruwara.

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: Karka gives Shravana. The Sun enters Simha on 16 Aug, inside the month. The next new moon, 2 Sep, finds it in Simha and begins Bhadrapada.

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 4 Aug, with the Sun in Karka, began Shravana. This Shukla paksha reads Shravana in both counts.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 7 Apr 1978, 19:15 Fri. Since then the Sun has moved 126.4° round the stars. Vikram Samvat numbers that year 2035; Shaka Samvat numbers it 1900.