Panchang in Thazhecode, Kerala Mon 18 Dec 2017

Amavasya follows the tithi at sunrise. Amavasya runs from 09:29 on Sun 17 Dec to 12:00 on Mon 18 Dec, so it holds sunrise only on Mon 18 Dec, at 06:38. No text giving Amavasya’s time was found; sunrise is Tithika’s convention.

Amavasya: every date in Thazhecode

The Moon gains on the Sun about 12° a day. Each 12° of lead is one tithi: 348°–360° is the 30th, Krishna Amavasya. A day takes the tithi in force at its sunrise, 06:38 here. Chaturdashi ended at 09:29 Sun, before it. Amavasya ends at 12:00, when the lead reaches 360°. The lead passed 180° at the full moon of 3 Dec, so the Moon is waning: Krishna paksha.

The night of Sun 17 Dec ran from sunset 18:06 Sun to sunrise 06:38, 12 h 32 m. Cut into 15 muhurtas of 50 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 06:38 to 18:06, splits into 8 choghadiyas of 1 h 26 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 18:06 to 06:39 Tue, splits into 8 choghadiyas of 1 h 34 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′. Jyeshtha spans 226°40′–240°00′; the Moon entered its pada 4 at 236°40′. It leaves at 07:06, for Mula.

Add the Sun's and the Moon's places among the stars: 242.2° + 239.8° = 482°, one full turn and 122°. Past the turn, cut into 27 parts of 13°20′, it gives the yoga: 120°00′–133°20′ is the 10th, Ganda. It ends at 03:52 Tue, then Vriddhi.

A karana is half a tithi: 6° of the Moon's lead, so the first half of Amavasya is Chatushpada and the second Nagava. Chatushpada ended at 22:43 Sun, when the lead reached 354°; Nagava runs until 12:00.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 06:38 to 06:39 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: Vrishchika gives Margashirsha. The Sun enters Dhanu on 16 Dec, inside the month. The next new moon, 18 Dec, finds it in Dhanu and begins Pausha.

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 Dec, with the Sun in Dhanu, begins Pausha. Until then this Krishna paksha reads Pausha here, and Margashirsha in the amanta count.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 28 Mar 2017, 08:27 Tue. Since then the Sun has moved 258.7° round the stars. Vikram Samvat numbers that year 2074; Shaka Samvat numbers it 1939.