Edmond Halley (1656-1742), an English astronomer, mathematician, cartographer, geophysicist, and meteorologist. Halley (1656-1742), Astronomer Royal from 1720 until 1742, discovered the proper motions of stars and the periodicity of comets. He correctly calculated that the comets seen in 1531 and 1607 were the same objects that followed a 76 year orbit - the comet now know as 'Halley's Comet'.
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