Shashthi () also referred to as Chhath is the sixth day of the lunar fortnight in the Hindu calendar. It is tithi (lunar day) of a paksha, the fourteen-day phase of the moon.
The word comes from the Sanskrit cardinal á¹£aá¹£ (six), whence the ordinal number (linguistics) á¹£aá¹£á¹Âha (sixth), fem. á¹£aá¹£á¹Âhë (days of the paksha are feminine gender).
The sixth tithi, especially in the waxing period (shuklapaksha), is important in several rituals including: