Page 283 - 89 history of astronomy_opt

Edmund Halley succeeded Flamsteed as
Second Astronomer Royal in 1721. Although
he did not contribute directly to the math-
ematical proofs of Newton’s theory, yet his
name is closely associated with some of its
greatest successes.
He was the first to detect the acceler-
ation of the moon’s mean motion. Hip-
parchus, having compared his own observa-
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