Panchang in Diffa, Niger Sun 17 May 2015

Vat Savitri Vrat follows the tithi at sunrise. Amavasya begins at 07:29 on Sun 17 May, after that sunrise, and ends at 05:13 on Mon 18 May, before the next: it holds no sunrise. A tithi that holds no sunrise is kept on the day it is current: Sun 17 May. No text giving Vat Savitri Vrat’s time was found; sunrise is Tithika’s convention.

Vat Savitri Vrat: every date in Diffa

Amavasya follows the tithi at sunrise. Amavasya begins at 07:29 on Sun 17 May, after that sunrise, and ends at 05:13 on Mon 18 May, before the next: it holds no sunrise. A tithi that holds no sunrise is kept on the day it is current: Sun 17 May. No text giving Amavasya’s time was found; sunrise is Tithika’s convention.

Amavasya: every date in Diffa

The Moon gains on the Sun about 12° a day. Each 12° of lead is one tithi: 336°–348° is the 29th, Krishna Chaturdashi. A day takes the tithi in force at its sunrise, 05:43 here. Trayodashi ended at 10:01 Sat, before it. Chaturdashi ends at 07:29, when the lead reaches 348°. The lead passed 180° at the full moon of 4 May, so the Moon is waning: Krishna paksha.

A day takes the tithi in force at its sunrise. Amavasya began at 07:29 and ended at 05:13 Mon, between the sunrises of 05:43 and 05:43 Mon. Sunday reads Chaturdashi and Monday reads Pratipada: Amavasya is a kshaya tithi here.

The night of Sat 16 May ran from sunset 18:28 Sat to sunrise 05:43, 11 h 15 m. Cut into 15 muhurtas of 45 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 05:43 to 18:28, splits into 8 choghadiyas of 1 h 35 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 18:28 to 05:43 Mon, splits into 8 choghadiyas of 1 h 24 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′. Bharani spans 13°20′–26°40′; the Moon entered its pada 2 at 16°40′. It leaves at 18:44, for Krittika.

Add the Sun's and the Moon's places among the stars: 31.9° + 18.9° = 50.8°. The sum, cut into 27 parts of 13°20′, gives the yoga: 40°00′–53°20′ is the 4th, Saubhagya. It ends at 09:38, then Shobhana.

A karana is half a tithi: 6° of the Moon's lead, so the first half of Chaturdashi is Vishti and the second Shakuni. Vishti ended at 20:44 Sat, when the lead reached 342°; Shakuni runs until 07:29.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 05:43 to 05:43 Mon, so the hours after midnight still belong to Raviwara.

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: Mesha gives Vaishakha. The Sun enters Vrishabha on 15 May, inside the month. The next new moon, 18 May, finds it in Vrishabha and begins Jyeshtha.

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 18 May, with the Sun in Vrishabha, begins Jyeshtha. Until then this Krishna paksha reads Jyeshtha here, and Vaishakha in the amanta count.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 20 Mar 2015, 10:36 Fri. Since then the Sun has moved 56.5° round the stars. Vikram Samvat numbers that year 2072; Shaka Samvat numbers it 1937.