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What has been missed out here is that the Indian traders of eastern India have discovered the Monsoon patterns many centuries before Hippalus. It was their knowledge of the wind patterns in the Eastern Sea that helped them navigate to Southeast Asia with the retreating Monsoon in late October and sail back to India with the advancing Monsoon in May. The event of starting off the sea voyage is still symbolically celebrated in Odisha as the festival of Bali Jatra (voyage to Bali). The festival is celebrated on the full moon of the Hindu month of Kartik (fifteen days after Diwali).
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Vijender Sharma (Essays on Indic History (Lesser Known History of India Book 1))