Sir John Herschel

Sir John Frederick William Herschel, 1st Baronet KH FRS was an English polymath, mathematician, astronomer, chemist, inventor, experimental photographer who invented the blueprint, and did botanical work. Herschel originated the use of the Julian day system in astronomy. Wikipedia
Born: 7 March 1792, Slough
Died: 11 May 1871, Hawkhurst
Spouse: Margaret Brodie Stewart (m. 1829–1871)
Children: Alexander Stewart Herschel, MORE
Discovered: NGC 1998, NGC 7199, NGC 7289