On 23 Jun, 2011 By Anonymous (not verified)
Alfred H. Joy (1882–1973) was an astronomer at the Mount Wilson Observatory from 1915 to 1973 who measured spectroscopic parallaxes and radial velocities of stars and studied variable stars. He invented the T Tauri classification.
After graduating MA from Oberlin College in 1904, Joy went on to work at the American University of Beirut in the Syrian Protestant College as a professor of astronomy and the director of the observatory. He was forced to return to the U.S. in 1915 because of the 1st World War.
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