20 January

27 FEAB. 2004 Dáta foilsithe 975 Amhairc

1921: On 20 January 1921, Mary Watson Whitney died.

Whitney was an American astronomer who became the director of the Vassar observatory and a founding member of the American Astronomical Society.

She concentrated in particular on double stars, variable stars, asteroids, comets, and the precise measurement of photographic plates.


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