The Hindu ( Indian's ) systems of astronomy are by far the OLDEST

Jean-Sylvain Bailly, French Astronomer ,(1736-1793):

“The motion of the stars calculated by the Hindus ( Indian's ) BEFORE some 4500 years vary not even a single minute from the tables of Cassine and Meyer (used in the 19th century).

…The Hindu systems of astronomy are by far the OLDEST and THAT from which the Egyptians, Greek, Romans and - even the Jews derived from the Hindus their knowledge ”