Reino Antero Hirvonen (1908–1989) was a famous Finnish physical geodesist, also well known for contributions in mathematical and astronomical geodesy.
He also took an active interest in astronomy, acting from 1956 to 1964 as a vice president of the Finnish amateur astronomical society Ursa.
[2] In 1947 he led a team of Finnish scientists to Brazil to measure the distance between South America and Africa.
Using long focus film cameras and the most accurate available radio time signals for the solar eclipse measurements, they were able to calculate the distance between Africa and South America to a higher accuracy than ever before: 141 m.[3] 1951–1952 and 1954–1955 Hirvonen lectured in the Department of Geodetic Science at The Ohio State University, in Columbus, Ohio (USA).
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