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https://indictales.com/2018/01/02/yantra-chintamani-sinequadrant-sinecal-to-measure-celestial-angles-time-find-directions-determine-the-positions-of-celestial-object-made-by-hrsikesa-18th-century-astronomer/
Yantra Chintamani - SineQuadrant (sinecal) to measure celestial angles, time, find directions, determine the positions of celestial object. Made by Hrsikesa, 18th Century Astronomer