The most successful comet discoverer in history, Jean-Louis Pons, was born on this day in 1761. As a young man Pons started his astronomical career in the unassuming role of concierge at the observatory in Marseilles. He discovered his first comet in 1801 and went on to discover 36 more.
Jean-Louis Pons made the third (1805) and fourth (1818) discoveries of Comet Encke seen here with Comet ISON in late November 2013. Courtesy NASA