Panchang in Codcod, Western Visayas, Philippines Fri 25 Jul 2014

Shiva’s worship centres on nishitha, the midnight muhurta. Chaturdashi runs from 02:24 on Fri 25 Jul to 04:27 on Sat 26 Jul, so only Friday night’s nishitha (23:31–00:16 Sat) 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: 336°–348° is the 29th, Krishna Chaturdashi. A day takes the tithi in force at its sunrise, 05:34 here. Trayodashi ended at 02:24, before it. Chaturdashi ends at 04:27 Sat, when the lead reaches 348°. The lead passed 180° at the full moon of 12 Jul, so the Moon is waning: Krishna paksha.

The night of Thu 24 Jul ran from sunset 18:12 Thu to sunrise 05:34, 11 h 22 m. Cut into 15 muhurtas of 45 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 05:34 to 18:12, 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 night here, 18:12 to 05:35 Sat, splits into 8 choghadiyas of 1 h 25 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′. Ardra spans 66°40′–80°00′; the Moon entered its pada 3 at 73°20′. It leaves at 14:56, for Punarvasu.

Add the Sun's and the Moon's places among the stars: 97.8° + 75.3° = 173.1°. The sum, cut into 27 parts of 13°20′, gives the yoga: 160°00′–173°20′ is the 13th, Vyaghata. It ends at 05:54, then Harshana.

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 runs until 15:24, when the lead reaches 342°; Shakuni until 04:27 Sat.

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

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: Mithuna gives Ashadha. The Sun enters Karka on 17 Jul, inside the month. The next new moon, 27 Jul, finds it in Karka and begins Shravana.

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 27 Jul, with the Sun in Karka, begins Shravana. Until then this Krishna paksha reads Shravana here, and Ashadha in the amanta count.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 31 Mar 2014, 02:44 Mon. Since then the Sun has moved 111.9° round the stars. Vikram Samvat numbers that year 2071; Shaka Samvat numbers it 1936.