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Mary R. Calvert

Mary R. Calvert
Mary R. Calvert, American astronomer and author (d. 1974)

Mary Ross Calvert was an American astronomical computer and astrophotographer. She started as her uncle Edward Emerson Barnard's assistant and ended publishing his work that cataloged over 300 dark objects — primarily those that extinguish the most starlight reaching the Earth lie between the bulk thus between the Local Arm and the Sagittarius Arm. She went on to publish other photographic works on astronomy.

20 June 1884

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