It is celebrated on the navami (ninth day) of the Shukla Paksha (first lunar fortnight) of the Hindu month of Vaishakha.

[1] According to the Ramayana, the infant Sita appeared or manifested from a divine earthen pot in the kingdom of Mithila from a farm field to King Siradhvaja Janaka and Queen Sunayana.

[2] According to regional tradition, this site is identified to be at the Punaura Dham of the Sitamarhi district of Bihar, India.

The date and time of the manifestation of the infant Sita is recorded as the ninth day of Shukla Navami in the Vaishakha month of Pushya nakshatra in the Ramayana.

On the occasion of Sita Navami, married women fast for their husbands's long life.