Panchang in Codcod, Western Visayas, Philippines Tue 18 Apr 2023

Shiva’s worship centres on nishitha, the midnight muhurta. Chaturdashi runs from 15:57 on Tue 18 Apr to 13:54 on Wed 19 Apr, so only Tuesday night’s nishitha (23:23–00:09 Wed) falls within it. No text giving Masik Shivratri’s time was found; nishitha is Tithika’s convention.

Masik Shivratri: every date in Codcod

The Moon gains on the Sun about 12° a day. Each 12° of lead is one tithi: 324°–336° is the 28th, Krishna Trayodashi. A day takes the tithi in force at its sunrise, 05:35 here. Dwadashi ended at 18:16 Mon, before it. Trayodashi ends at 15:57, when the lead reaches 336°. The lead passed 180° at the full moon of 6 Apr, so the Moon is waning: Krishna paksha.

The night of Mon 17 Apr ran from sunset 17:58 Mon to sunrise 05:35, 11 h 37 m. Cut into 15 muhurtas of 46 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 05:35 to 17:58, 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 night here, 17:58 to 05:34 Wed, 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 fixed stars divide the Moon's path into 27 nakshatras of 13°20′, each in 4 padas of 3°20′. Uttara Bhadrapada spans 333°20′–346°40′; the Moon entered its pada 1 at 333°20′. It leaves at 03:31 Wed, for Revati.

Add the Sun's and the Moon's places among the stars: 3.4° + 333.7° = 337.1°. The sum, cut into 27 parts of 13°20′, gives the yoga: 333°20′–346°40′ is the 26th, Indra. It ends at 20:38, then Vaidhriti.

A karana is half a tithi: 6° of the Moon's lead, so the first half of Trayodashi is Garaja and the second Vanija. Garaja ended at 05:05, when the lead reached 330°; Vanija runs until 15:57.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 05:35 to 05:34 Wed, so the hours after midnight still belong to Mangalawara.

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 14 Apr, inside the month. The next new moon, 20 Apr, 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 20 Apr, with the Sun in Mesha, begins Vaishakha. Until then this Krishna paksha reads Vaishakha here, and Chaitra in the amanta count.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 22 Mar 2023, 01:23 Wed. Since then the Sun has moved 26.8° round the stars. Vikram Samvat numbers that year 2080; Shaka Samvat numbers it 1945.