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Jupiter: Past and Present Spots/Impacts

December 1690 sketch of new dark spot on Jupiter by G. D. Cassini and changes to the spot over 18 days

My first sketch of SL 9 impacts on Jupiter July 18, 1994.

My July 26, 2009 sketch of the impact on Jupiter, discovered by Anthony Wesley (upper left 11-o’clock spot)

Anthony Wesley's preliminary [...]