When Sun and Moon are together at the same degree it is called Amavasya or New Moon Day. As Moon travels away from Sun, at each12 degree of difference , a new Thithi is formed. When the difference is 180 degrees it is Poornima or Full Moon Day.
Thithi = (Long of Moon – Long of Sun) / 12
In all there are 30 Thithis. 15 in Bright half (Sukla paksha ) and 15 in Dark half (Krishna paksha).
1-6-11 are Nanda thithis
2-7-12 are Badra thithis
3-8-13 are Jaya thithis
4-9-14 are Riktha thithis (Inauspicious)
5-10-15/30 are Poorna Thithis
Thithi: KSHAYA: If a Thithi starts after Sun rise and ends before next Sun rise, it is called Thithi Kshaya or (loss of Thithi). It should be avoided in all good Muhurtas.
Thithi : VRIDHI : If a Thithi prevails at the Sun rise time or in other words, if a Thithi starts before one Sun rise and ends after next Sun rise , it is called Thithi Vridhi. It should also be avoided in all good Muhurtas
Thithi : GANDANTHA : The ending one ghati of Poorna Thithi and starting one ghati ( 24 ‘ ) of Nanda Thithi are called junction points or Thithi Gandantas. These should be avoided for Muhurtas.
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