Henrietta Swan Leavitt, in 1893, joins the Harvard computers, a group of women engaged in the production of astronomical data at Harvard; she is instrumental in discovery of the cepheid variable stars, which were evidence for the expansion of the universe.
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From 1916 to 1957, Harvard College astronomer Margaret Harwood (1885-1979) directed the Maria Mitchell Observatory on Nantucket Island, and ran its female-founded and female-run nonprofit science education institute; she spent summers on the island doing research and conducting classes.