Why Halley Did Not Discover Proper Motion and Why Cassini Did
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DOI: 10.1177/0021828619877967
Abstract: In 1717, Halley compared contemporaneous measurements of the latitudes of four stars with earlier measurements by ancient Greek astronomers and by Brahe, and from the differences concluded that these four stars showed proper motion. An… read more here.
Keywords: halley discover; halley; discover proper; motion cassini ... See more keywords