- American Astronomical Society
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- Division on Dynamical Astronomy, Chairman, 1986--1987
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- Harlow Shapley Lectureship 1981--1985
- International Astronomical Union
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- Commission 4, Ephemerides, Secretary, 1991--...
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- Commission 7, Celestial Mechanics
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- Commission 24, Photographic Astronomy
- Royal Astronomical Society Fellow
- Sigma Xi, University of South Florida Chapter, President 1983--1984
Carol Williams