David Rittenhouse (1732-1796), American astronomer and instrument maker, was a noted amateur scientist who constructed the finest orrery made at that time.

David Rittenhouse was born on April 8, 1732, near Germantown, Pa., into a poor farming family. He was stimulated by some books and tools of his uncle's and evidently educated himself in mathematics and astronomy. With help and encouragement from an Episcopal clergyman, he continued to advance his mathematical knowledge. In 1763 his boundary survey for Pennsylvania was so accurate that it was later accepted by the English surveyors Charles Mason and Jeremiah Dixon.

In 1767 Rittenhouse began his masterwork, the finest and most accurate orrery of that period. This mechanical representation of the movement of the planets through the universe was used widely in teaching and demonstration in the 18th century and also served as a demonstration of the reasonableness of nature. Rittenhouse's first orrery was capable of reproducing...