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Henrietta Swan Leavitt

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Henrietta Swan Leavitt: American Astronomer | 7 Days Of Genius | MSNBC

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Henrietta Leavitt & the Human Computers: Great Minds

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Who is Henrietta Swan Leavitt? | DNews

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Henrietta Leavitt: Unsung Heroine in Science

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the Cepheids

Henrietta Swan Leavitt was an American astronomer who discovered the relation between the luminosity and the period of Cepheid variable stars. A graduate of Radcliffe College, Leavitt started working at the Harvard College Observatory as a "computer" in 1893, examining photographic plates in order to measure and catalog the brightness of the stars. Though she received little recognition in her lifetime, it was her discovery that first allowed astronomers to measure the distance between the Earth and faraway galaxies. She explained her discovery: "A straight line can readily be drawn among each of the two series of points corresponding to maxima and minima, thus showing that there is a simple relation between the brightness of the variables and their periods."
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