It is believed that Chhath Puja was prevalent even in the Dwapar era. Pandavas themselves also worshiped Suryadev and Shashtidev. The vessel (Akshaya Patra) from which the Pandavas used to get food during their exile was also given to them by Suryadev. After becoming the king of Hastinapur, all the brothers like Yudhishthir worshiped Sun God. It is seen as Chhath Puja only.
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