The Antiquities of Orissa v2.c17.131

v2.c17.131

10. *Ṣoḍaṣadina-parava*, or the feast of 16 days. It commences on the 8th of the wane, and terminates on the 8th of the waxing moon in Āśvina. The dread god is worshipped on these days with special rituals amidst feasting and rejoicing, and on the last day is taken, by proxy, to the island on the Vindu Sāgara tank, and there entertained with music and dancing. This is a modification of the Durgā pūja which in Bengal commences on the 9th of the wane and terminates on the 9th of the waxing moon of that month. Why this change has been made I could not ascertain.