High Quality Content by WIKIPEDIA articles! Daniel Kirkwood (September 27, 1814 - June 11, 1895) was an American astronomer. Born in Harford County, Maryland, he was 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 in Bloomington, Indiana, where he stayed until his retirement in 1886, with the exception of two years, 1865-1867, at Jefferson College in Canonsburg, Pennsylvania. Kirkwood's most significant contribution came from his study of asteroid orbits. When arranging the then-growing number of discovered asteroids by their distance from the Sun, he noted several gaps[1], now named Kirkwood gaps in his honor, and associated these gaps with orbital resonances with the orbit of Jupiter.

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