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In vedic timekeeping, a tithi (also spelled thithi) is a lunar day, or the time it takes for the longitudinal angle between the moon and the sun to increase by 12°. Tithis begin at varying times of day and vary in duration from approximately 19 to approximately 26 hours.
There are 30 tithis in each lunar month, named as follows:
| | Krsna paksa
(dark fortnight) | Gaura paksa
(bright fortnight)
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| 1 | Pratipat | Pratipat
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| 2 | Dvitiya | Dvitiya
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| 3 | Trtiya | Trtiya
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| 4 | Caturthi | Caturthi
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| 5 | Pancami | Pancami
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| 6 | Sasti | Sasti
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| 7 | Saptami | Saptami
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| 8 | Astami | Astami
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| 9 | Navami | Navami
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| 10 | Dasami | Dasami
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| 11 | Ekadasi | Ekadasi
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| 12 | Dvadasi | Dvadasi
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| 13 | Trayodasi | Trayodasi
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| 14 | Caturdasi | Caturdasi
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| 15 | Amavasya
(new moon) | Purnima
(full moon)
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Ekadasi, the eleventh day of each lunar fortnight, has special religious significance in Hinduism and Jainism -- usually observed by fasting.
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