Reverend Robert Main (July 12 1808 – May 9 1878) was a British astronomer.
He served for twenty-five years as First Assistant at the Royal Greenwich Observatory. In 1860 he became director of Radcliffe Observatory at Oxford University after the death of Manuel John Johnson.
He won the Gold Medal of the Royal Astronomical Society in 1858.
He published the textbook Practical and Spherical Astronomy in 1863.
A crater on Mars is named after him.
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