Panchang in Codcod, Western Visayas, Philippines Wed 7 Oct 1981

Maha Navami follows the tithi at sunrise. Navami holds both sunrises, 05:35 on Wed 7 Oct and 05:35 on Thu 8 Oct. Over two sunrises the Nirnayasindhu takes the first: Wed 7 Oct. No text giving Maha Navami’s time was found; sunrise is Tithika’s convention.

Maha Navami: every date in Codcod

The Moon gains on the Sun about 12° a day. Each 12° of lead is one tithi: 96°–108° is the 9th, Shukla Navami. A day takes the tithi in force at its sunrise, 05:35 here. Ashtami ended at 04:37, before it. Navami ends at 05:52 Thu, when the lead reaches 108°. The lead passed 0° at the new moon of 28 Sep, so the Moon is waxing: Shukla paksha.

A day takes the tithi in force at its sunrise. Navami began at 04:37, before sunrise at 05:35, and ends at 05:52 Thu, after the next sunrise at 05:35 Thu. Both days read Navami: it is a vriddhi tithi here.

The night of Tue 6 Oct ran from sunset 17:34 Tue to sunrise 05:35, 12 h 1 m. Cut into 15 muhurtas of 48 m, its 14th is Brahma Muhurta, the one before the last.

Daylight here, 05:35 to 17:34, splits into 8 choghadiyas of 1 h 29 m. Their names follow a fixed order that starts from the weekday, and each name is counted good, neutral or bad.

The night here, 17:34 to 05:35 Thu, splits into 8 choghadiyas of 1 h 30 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′. Purva Ashadha spans 253°20′–266°40′; the Moon entered its pada 4 at 263°20′. It leaves at 06:08, for Uttara Ashadha.

Add the Sun's and the Moon's places among the stars: 169.9° + 266.4° = 436.3°, one full turn and 76.3°. Past the turn, cut into 27 parts of 13°20′, it gives the yoga: 66°40′–80°00′ is the 6th, Atiganda. It ends at 12:13, then Sukarma.

A karana is half a tithi: 6° of the Moon's lead, so the first half of Navami is Balava and the second Kaulava. Balava runs until 17:20, when the lead reaches 102°; Kaulava until 05:52 Thu.

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

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: Kanya gives Ashwina. The Sun enters Tula on 17 Oct, inside the month. The next new moon, 28 Oct, finds it in Tula and begins Kartika.

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 28 Sep, with the Sun in Kanya, began Ashwina. This Shukla paksha reads Ashwina in both counts.

A samvat year begins with Chaitra, the month whose new moon finds the Sun in Meena: 5 Apr 1981, 04:19 Sun. Since then the Sun has moved 178.5° round the stars. Vikram Samvat numbers that year 2038; Shaka Samvat numbers it 1903.