Alfred Harrison Joy was a distinguished stellar astronomer who spent most of his professional career at the Mount Wilson Observatory. His work on stellar radial velocities, variable stars, and galactic structure in the early twentieth century laid the groundwork for the rapidly expanding field of astrophysics. His pioneering work, his long tenure at Mount Wilson, his central roles in the Astronomical Society of the Pacific and American Astronomical Society, and his position as Secretary of the Observatory make him a significant figure in the history of astronomy.

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