Karva Chauth is a one-day festival celebrated by Hindu women from some regions of India, especially northern India, four days after purnima (a full moon) in the month of Kartika. Like many Hindu festivals, Karva 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, in the Hindu lunisolar calendar month of Kartik. On Karva Chauth, the married women, especially in Northern India, fast from sunrise to moonrise for the safety and longevity of their husbands. The Karva Chauth fast is traditionally celebrated in the states of Delhi, Haryana, Rajasthan, Punjab, Jammu, Uttar Pradesh, Himachal Pradesh and Madhya Pradesh. It is celebrated as Atla Tadde in Andhra Pradesh.
