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Johann Franz Encke
1791 - 1865
Johann Franz Encke, (born Sept. 23, 1791, Hamburg—died Aug. 26, 1865, Spandau, Ger.), German astronomer who in 1819 established the period of the comet now known by his name - Encke’s Comet.
"Johann Franz Encke." Encyclopaedia Britannica. Encyclopaedia Britannica Online Academic Edition. Encyclopædia Britannica Inc., 2014. Web. 18 Sep. 2014. <http://www.britannica.com.ezp-prod1.hul.harvard.edu/EBchecked/topic/186524/Johann-Franz-Encke>.