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Through tedious and exacting comparisons of photographic plates, Leavitt discovered some 2,400 variable stars and the period-luminosity relation for Cepheid-type variable stars, the key to modern astronomical distance determinations. She received her A.B. degree from Radcliffe College in 1892, when women could not yet earn a Harvard degree. The Harvard College Observatory employed female assistants, although they were not allowed to observe, and Leavitt became chief of the photographic photometry department. See also Annie Jump Cannon |
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