In Chicago Cyrus, Leander and their brother William founded what became the McCormick Harvesting Machine Company and eventually International Harvester.
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The dome, at 45 feet, was the largest in the world when completed; it was designed by Warner and Swasey with a unique three shutter design.
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In 1877 while the McCormick Refractor was still in Cambridgeport, Alvan Clark used it to verify the discovery of the moons of Mars the night after the discovery observations were made by Asaph Hall with the Naval Observatory refractor.
Royal Observatory, Greenwich | observatory | Royal Observatory | Paris Observatory | Robert R. McCormick | Palomar Observatory | Yerkes Observatory | Arecibo Observatory | Siding Spring Observatory | Mount Wilson Observatory | Smithsonian Astrophysical Observatory | Observatory | Harvard College Observatory | Ondřejov Observatory | Lowell Observatory | Kew Observatory | Roque de los Muchachos Observatory | Pulkovo Observatory | McDonald Observatory | Jodrell Bank Observatory | Chandra X-ray Observatory | Solar Dynamics Observatory | National Astronomical Observatory of Japan | McCormick Theological Seminary | McCormick Foundation | Maureen McCormick | Las Campanas Observatory | European Southern Observatory | Cyrus McCormick | Allegheny Observatory |
In 1944 he left McCormick Observatory and became head of the Photographic Division at the Ballistic Research Laboratory of the U.S. Army Aberdeen Proving Ground in Aberdeen, Maryland.