अर्काद्विनिसृज:
प्राचीं यद्यात्यहरह: शद्री।
तच्चान्द्रमानमंद्गौस्तु ज्ञेया द्वादद्गाभिस्तिथि:॥
{सूर्य सिद्धांत--मानाध्याय, श्लोक-13}A Tithi is a lunar day After the conjunction of Sun & Moon the time taken by Moon to go ahead of Sun by 12 degree is the period of 1 tithi. The average time of a tithi is 23H 37M 28S
Tithis vary in duration from
approximately 19 to 26 hours, according to the movement of the Moon. Each tithi
has a name, a ruling planet, and can be used in Muhurta (picking a proper
time).Amavasya is when the Sun and Moon's longitude is the same again.
Formula
to calculate tithi :
Longitude of Moon
–Longitude of Sun
12
13
Apr 2014
