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Who contributed to the development of the Harvard system of stellar classification?

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The Harvard system was developed with contributions from Williamina P. Fleming, Antonia C. Maury, and Annie Jump Cannon. Fleming had originally classified stars alphabetically from A to Q, based on the strength of their hydrogen spectral lines. Cannon simplified this scheme to O, B, A, F, G, K, and M. It was later realized that this sequence arose from the star’s temperature.