6. What is Tithi
Also known as lunar day, one Tithi is said to be complete when Moon has moved 12° from the Sun. The names of the tithi are given below.
It is perhaps known to all that size (shape) of Moon either increases or decreases. The day, when the shape of Moon is a complete circle, is known as Poornima or Full Moon day. From the Full Moon day, the Moon starts decreasing day by day, till it disappears after 15 days. The day, when it is not visible, is called Amavasya or New Moon. Increasing Moon is called waxing Moon and decreasing Moon is called waning Moon. The period when Moon is increasing is called the Bright Half and the period when Moon is waning is called the Dark Half.
Tithi
Bright Half Dark Half
1. Pratipada 1. Pratipada
2. Dwitya 2. Dwitya
3. Tratiya 3. Tratiya
4. Chaturthi 4. Chaturthi
5. Panchami 5. Panchami
6. Shashthi 6. Shashthi
7. Saptami 7. Saptami
8. Ashtami 8. Ashtami
9. Nawami 9. Nawami
10. Dashmi 10. Dashmi
11. Ekadashi 11. Ekadashi
12. Dwadasi 12. Dwadasi
13. Trayodashi 13. Trayodashi
14. Chaturdashi 14. Chaturdashi
15. Poornima 15. Amavasya