Panchang in Sevan, Gegharkunik, Armenia Sat 9 Apr 1921

Ghatasthapana is done in pratahkala, the first fifth of the day. Pratipada runs from 12:02 on Fri 8 Apr to 11:41 on Sat 9 Apr, so only Saturday’s pratahkala (05:30–08:06) falls within it. No text giving Chaitra Navratri · Ghatasthapana’s time was found; pratahkala is Tithika’s convention.

Chaitra Navratri: every date in Sevan

Vikram Samvat 1978 begins on the day Chaitra Shukla Pratipada holds sunrise: Sat 9 Apr, at 05:30. Pratipada lasts until 11:41.

Nav Samvatsar: 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, 05:32 here. Amavasya ended at 12:04 Fri, before it. Pratipada ends at 11:43, when the lead reaches 12°. The lead passed 0° at the new moon of 8 Apr, so the Moon is waxing: Shukla paksha.

The night of Fri 8 Apr ran from sunset 18:31 Fri to sunrise 05:32, 11 h 1 m. Cut into 15 muhurtas of 44 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 05:32 to 18:32, splits into 8 choghadiyas of 1 h 37 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 18:32 to 05:30 Sun, splits into 8 choghadiyas of 1 h 22 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′. Ashwini spans 0°00′–13°20′; the Moon entered its pada 2 at 3°20′. It leaves at 20:58, for Bharani.

Add the Sun's and the Moon's places among the stars: 355.9° + 4.8° = 360.7°, one full turn and 0.7°. Past the turn, cut into 27 parts of 13°20′, it gives the yoga: 0°00′–13°20′ is the 1st, Vishkambha. It ends at 02:41 Sun, then Priti.

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 23:57 Fri, when the lead reached 6°; Bava runs until 11:43.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 05:32 to 05:30 Sun, so the hours after midnight still belong to Shaniwara.

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: Meena gives Chaitra. The Sun enters Mesha on 13 Apr, inside the month. The next new moon, 7 May, finds it in Mesha and begins Vaishakha.

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 8 Apr, with the Sun in Meena, began Chaitra. This Shukla paksha reads Chaitra in both counts.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 8 Apr 1921, 12:04 Fri. Since then the Sun has moved 0.7° round the stars. Vikram Samvat numbers that year 1978; Shaka Samvat numbers it 1843.