How is Chhath Puja linked to the Ramayana?

Chhath Puja is linked to the Ramayana as Goddess Sita observed a fast and worshipped the Sun God on the sixth day after returning from the exile, Wion reported. The ritual is believed to have led to the birth of her twin sons. Sita Charan Mandir in Bihar is believed to mark the site where Goddess Sita performed the ritual.