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Solar Imagery - Photosphere - Sunspot Drawings - McMath-Hulbert Observatory
browse graphic The McMath-Hulbert Observatory is a decommissioned solar observatory in Lake Angelus, Michigan, USA. It was established in 1929 as a private observatory by father and son Francis Charles McMath and Robert Raynolds McMath and their friend, Judge Henry Hulbert. In 1932 the observatory was deeded to the University of Michigan which operated it until 1981, at which time it was sold into private ownership again (Wikipedia). The daily sunspot drawings in this collection were prepared by professional observatory staff and provided to the NOAA National Geophysical Data Center as a member of the World Data Service for Geophysics, Boulder (formerly the World Data Center-A) for permanent archive and public distribution. The available data is from June 24, 1942 to December 31, 1960. Drawings are not available for all days presumably limited by viewing conditions (weather) and other factors. The original paper records were digitized through the NOAA Climate Data Modernization Program (CDMP). Users of these data are kindly requested to acknowledge the McMath-Hulbert Observatory and the NOAA National Geophysical Data Center (NGDC)