Gerald Clemence

Gerald Maurice Clemence (16 August 1908 – 22 November 1974) was an American astronomer. Inspired by the life and work of Simon Newcomb, his career paralleled the huge advances in astronomy brought about by the advent of the electronic computer. Clemence did much to revive the prestige of the U.S. Nautical Almanac Office.

Born on a farm near Greenville, Rhode Island, Gerald's parents were Richard R. Clemence and his wife, Lora, née Oatley. Much of his elementary education was at home with his mother, herself a schoolteacher, and he learned about astronomy from his own enthusiastic reading. Clemence attended Brown University and read mathematics, achieving a PhB degree in 1930. In his own words, "as a recreation", he took the civil service examination for the job description "astronomer" and finished first out of fifty candidates, winning appointment at the United States Naval Observatory. Taking up the post, he married Edith Melvina Vail, a nurse, in 1929.

After initial work in the Time Service Department, alongside William Markowitz, Clemence was assigned to work under H. R. Morgan. George William Hill had computed the orbits of Jupiter and Saturn in the nineteenth century and Newcomb had completed the work for the other planets of the solar system. However, there was now almost fifty years of new observational data and Clemence set to recalculate the orbital elements of Mercury to provide more accurate predictions. His results, published in 1943, clearly showed the perihelion precession of Mercury predicted by the general theory of relativity.

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