Johann Franz Encke, 19th century German astronomer. Encke (1791-1865) proved that the comet of 1818 had already been observed in 1786, 1795 and 1805. It has since been known as Encke's comet. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Heritage Images / Oxford Science Archive |
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