October 20, 1497
Astronomer, Nicolaus Copernicus receives notification of his appointment as a canon at Frauenburg Cathedral.
October 20, 1632
British architect, astronomer, and geometrician, Sir Christopher Wren, is born in East Knoyle, Wiltshire. Through astronomy, he developed skills in working models, diagrams and charting that proved useful when he entered architecture. His scientific work was highly regarded by Sir Isaac Newton and Blaise Pascal.
October 20, 1786
Harvard University organizes first astronomical expedition in the United States.
October 20, 1994
A small meteorite falls through a roof in Coleman, Michigan.
October 20, 2009
European astronomers announce the discovery 32 extrasolar planets.