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John Fillmore Hayford (May 19, 1868 – March 10, 1925) was an eminent United States geodesist. His work involved the study of isostasy and the construction of a reference ellipsoid for approximating the figure of the Earth. The crater Hayford on the far side of the Moon is named after him.[1] Mount Hayford, a 1,871 m mountain peak near Metlakatla, Alaska, United States, is named after him.[2] A biography of Hayford may be found in the Biographical Memoirs of the National Academy of Sciences, 16 (5), 1935.

John Fillmore Hayford
John Fillmore Hayford.JPG
John Fillmore Hayford
Born May 19, 1868
Rouses Point, New York
Died March 10, 1925 (1925-03-11) (aged 56)
Evanston, Illinois
Nationality United States
Citizenship United States
Alma mater Cornell University College of Engineering
Known for isostasy
Awards Honorary doctorate from George Washington University 1918; Victoria Medal of the Royal Geographical Society 1924
Scientific career
Fields geodesy
Institutions United States Coast and Geodetic Survey; Northwestern University, College of Engineering

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