When1: 1911
When2: 1914
Who: Annie Jump Cannon [Cannon, Annie Jump]
What: astronomer
Where: USA
works\ Henry Draper Catalog [1914]
Detail: She lived 1863 to 1941, cataloged many stars, and invented star spectral classification system: O, B, A, F, G, K, and M.
Physical Sciences>Astronomy>History>Star Catalogers
5-Astronomy-History-Star Catalogers
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Date Modified: 2022.0224