Create a realistic portrait of John Frederick William Herschel, a 19th-century British astronomer, mathematician, and chemist, sitting in a study with a backdrop of astronomical instruments, books, and papers, wearing formal attire and holding a pair of glasses and a pencil, with a thoughtful expression, in a style reminiscent of Victorian-era photography.
gptkb:Herschelian_telescope
coining the terms 'photography', 'negative', and 'positive'
cataloguing southern hemisphere stars
contributions to photography
discovering several moons of Saturn and Uranus