Panchang in Ipameri, Goiás, Brazil Mon 13 Apr 1964

Ghatasthapana is done in pratahkala, the first fifth of the day. Pratipada runs from 09:37 on Sun 12 Apr to 06:29 on Mon 13 Apr, so it touches only Monday’s pratahkala (06:21–08:42). No text giving Chaitra Navratri · Ghatasthapana’s time was found; pratahkala is Tithika’s convention.

Chaitra Navratri: every date in Ipameri

The Sun enters Mesha at 03:22, after sunset (18:05 Sun), so the next day keeps it: Mon 13 Apr. No text giving Mesha Sankranti’s time was found; sankranti is Tithika’s convention.

Mesha Sankranti: every date in Ipameri

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, 06:21 here. Amavasya ended at 09:37 Sun, before it. Pratipada ends at 06:29, when the lead reaches 12°. The lead passed 0° at the new moon of 12 Apr, so the Moon is waxing: Shukla paksha.

A day takes the tithi in force at its sunrise. Dwitiya began at 06:29 and ended at 03:13 Tue, between the sunrises of 06:21 and 06:21 Tue. Monday reads Pratipada and Tuesday reads Tritiya: Dwitiya is a kshaya tithi here.

The night of Sun 12 Apr ran from sunset 18:05 Sun to sunrise 06:21, 12 h 16 m. Cut into 15 muhurtas of 49 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 06:21 to 18:04, splits into 8 choghadiyas of 1 h 27 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 18:04 to 06:21 Tue, splits into 8 choghadiyas of 1 h 32 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 4 at 10°. It leaves at 08:26, for Bharani.

Add the Sun's and the Moon's places among the stars: 0.1° + 12° = 12.1°. The sum, cut into 27 parts of 13°20′, gives the yoga: 0°00′–13°20′ is the 1st, Vishkambha. It ends at 08:07, 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 20:04 Sun, when the lead reached 6°; Bava runs until 06:29.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 06:21 to 06:21 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: Meena gives Chaitra. The Sun enters Mesha on 13 Apr, inside the month. The next new moon, 11 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 12 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: 13 Mar 1964, 23:13 Fri. Since then the Sun has moved 29.9° round the stars. Vikram Samvat numbers that year 2021; Shaka Samvat numbers it 1886.