Karwa Chauth is a festival celebrated by Hindu women of Northern and Western India on the fourth day after Purnima (a full moon) in the month of Kartika. Like many Hindu festivals, Karwa Chauth is based on the lunisolar calendar which accounts for all astronomical positions, especially positions of the moon which is used as a marker to calculate important dates. The festival falls on the fourth day after the full moon.

On Karwa Chauth, married women, especially in North India, observe fast from sunrise to moonrise for the safety and longevity of their husbands. The Karwa Chauth fast is traditionally celebrated in the states of Delhi, Haryana, Rajasthan, Punjab, Jammu, chhattisgarh, Uttar Pradesh, Himachal Pradesh and Madhya Pradesh.

On this day wives keep fast for the whole day for showing their devotion towards their husband. And, they break the fast only after seeing the Moon in night by drinking water from their husband’s hand.