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Today in Science History - April 13 - Annie Jump Cannon and Star Classification
https://sciencenotes.org/today-in-science-history-april-13-annie-jump-cannon/
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April 13 marks the passing of Annie Jump Cannon. Cannon was an American astronomer who developed the Oh! Be A Fine Girl. Kiss Me! star classification system in use today. Find out more and what else occurred April 13 in science history.
