Thiruvathirai is a Hindu festival celebrated in the Indian states of Tamil Nadu and Kerala. Thiruvathira is celebrated on Thiruvathirai day in the month of Sagittarius. It was once a festival that was confined to the upper castes of Thiruvathira Brahmins, Nairs, Ambalavasis and others. The first Thiruvathira after the marriage of Hindu girls is called Puthan Thiruvathira. This is a great celebration.