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https://indictales.com/2019/10/07/gautama-siddha-qutan-xida-the-8th-century-astronomer-who-introduced-the-chinese-to-aryabhatas-sine-table-vedic-calender-indian-numerals-with-zero/
Gautama Siddha (Qutan Xida): The 8th Century Astronomer Who Introduced The Chinese To Aryabhata's Sine Table, Vedic Calender & Indian Numerals With Zero