Panchang in Polatlı, Ankara, Turkey Fri 1 May 2015

Shiva’s Pradosh puja is done in pradosha, the 3 muhurtas after sunset. Trayodashi runs from 01:39 on Fri 1 May to 03:47 on Sat 2 May, so only Friday’s pradosha (19:45–21:46) falls within it. No text giving Pradosh Vrat’s time was found; pradosha is Tithika’s convention.

Pradosh Vrat: every date in Polatlı

The Moon gains on the Sun about 12° a day. Each 12° of lead is one tithi: 144°–156° is the 13th, Shukla Trayodashi. A day takes the tithi in force at its sunrise, 05:53 here. Dwadashi ended at 01:39, before it. Trayodashi ends at 03:47 Sat, when the lead reaches 156°. The lead passed 0° at the new moon of 18 Apr, so the Moon is waxing: Shukla paksha.

The night of Thu 30 Apr ran from sunset 19:44 Thu to sunrise 05:53, 10 h 9 m. Cut into 15 muhurtas of 40 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 05:53 to 19:45, splits into 8 choghadiyas of 1 h 44 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 19:45 to 05:51 Sat, splits into 8 choghadiyas of 1 h 15 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′. Hasta spans 160°00′–173°20′; the Moon entered its pada 1 at 160°. It leaves at 03:57 Sat, for Chitra.

Add the Sun's and the Moon's places among the stars: 16.4° + 162.3° = 178.7°. The sum, cut into 27 parts of 13°20′, gives the yoga: 173°20′–186°40′ is the 14th, Harshana. It ends at 20:43, then Vajra.

A karana is half a tithi: 6° of the Moon's lead, so the first half of Trayodashi is Kaulava and the second Taitila. Kaulava runs until 14:46, when the lead reaches 150°; Taitila until 03:47 Sat.

A Hindu day runs from one sunrise to the next, not midnight to midnight. This one runs 05:53 to 05:51 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: 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 Apr, with the Sun in Mesha, began Vaishakha. This Shukla paksha reads Vaishakha in both counts.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 20 Mar 2015, 11:36 Fri. Since then the Sun has moved 41° round the stars. Vikram Samvat numbers that year 2072; Shaka Samvat numbers it 1937.