The Indian system of astronomy is by far the oldest. It was the source from which the Egyptians, Greeks, Romans and Jews derived their knowledge. The motion of the stars on the tables of Giovanni Cassini and Tobias Mayer, used in the 19th century, do not vary by even a minute from Indian calculations made 4,500 years before. Indian tables give the same annual variation of the moon as discovered by Tycho Brahe — a variation unknown to the schools of Alexandria and the Arabs.

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