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Daniel Kirkwood (September 27, 1814 - June 11, 1895) was an American astronomer.
Born in Harford County, Maryland, he graduated in mathematics from the York County Academy in York, Pennsylvania in 1838. After teaching there for five years, he became Principal of the Lancaster High School in Lancaster, Pennsylvania, and after another five years he moved on to become Principal of the Pottsville Academy in Pottsville, Pennsylvania. In 1851 he became Professor of Mathematics at Delaware College and in 1856 Professor of Mathematics at Indiana University, where he stayed till his retirement in 1886.
The most significant contribution of Daniel Kirkwood was his study in the orbits of the asteroids. In 1866 he published¹ the discovery of gaps in the distances of asteroids from the sun, named Kirkwood gaps in his honor. He also was the first to suggest that meteor showers are debris from comets.
He died in Riverside, California in 1895.
Altogether he authored 129 publications, including three books. The asteroid 1951 AT was named 1578 Kirkwood in his honor and so was the lunar impact crater Kirkwood. He is buried in the Rose Hill Cemetery in Bloomington, Indiana.
References
¹ "On the Theory of Meteors," Proceedings of American Association for the Advancement of Science for 1866 (1867): 8-14. He actually first noticed it in 1857.
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