Panchang in Sofia, Sofia-Capital, Bulgaria Sun 4 Aug 2013

Shiva’s worship centres on nishitha, the midnight muhurta. Chaturdashi runs from 20:56 on Sun 4 Aug to 23:03 on Mon 5 Aug, so only Sunday night’s nishitha (01:13 Mon–01:52 Mon) falls within it. No text giving Masik Shivratri’s time was found; nishitha is Tithika’s convention.

Masik Shivratri: every date in Sofia

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, 06:21 here. Dwadashi ended at 18:33 Sat, before it. Trayodashi ends at 20:56, when the lead reaches 336°. The lead passed 180° at the full moon of 22 Jul, so the Moon is waning: Krishna paksha.

The night of Sat 3 Aug ran from sunset 20:44 Sat to sunrise 06:21, 9 h 37 m. Cut into 15 muhurtas of 38 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 06:21 to 20:43, splits into 8 choghadiyas of 1 h 47 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 20:43 to 06:22 Mon, splits into 8 choghadiyas of 1 h 12 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 4 at 76°40′. It leaves at 11:57, for Punarvasu.

Add the Sun's and the Moon's places among the stars: 107.9° + 77.2° = 185.1°. The sum, cut into 27 parts of 13°20′, gives the yoga: 173°20′–186°40′ is the 14th, Harshana. It ends at 09:16, then Vajra.

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 runs until 07:46, when the lead reaches 330°; Vanija until 20:56.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 06:21 to 06:22 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: Mithuna gives Ashadha. The Sun enters Karka on 16 Jul, inside the month. The next new moon, 7 Aug, 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 7 Aug, 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: 10 Apr 2013, 12:35 Wed. Since then the Sun has moved 111.3° round the stars. Vikram Samvat numbers that year 2070; Shaka Samvat numbers it 1935.