HILL, George William, astronomer, born in New York city, 3 March, 1838. He was graduated at Rutgers college in 1859, and has since received the degree of Ph.D. from that institution. In 1861 he became assistant in the office of the "American Ephemeris and Nautical Almanac," which office he continues to fill. He made a canoe voyage in 1880 from Lake Superior to Moose Factory, Hudson bay, for the purpose of making a map of the route and photographs of the scenery. His researches on the lunar theory have attracted attention, and in 1887 he was awarded the gold medal of the Royal astronomical society of London for his investigations. He is a member of scientific societies, and in 1874 received an election to the National academy of sciences. Dr. Hill is the author of upward of forty articles and memoirs, in mathematical and astronomical journals or in transactions of scientific societies, having reference chiefly to mathematical astronomy.