John Herschel

Sir John Frederick William Herschel (7 March, 1792 – 11 May, 1871) was an English mathematician and astronomer. He was the son of astronomer William Herschel.

Related Topics:
Sir - 7 March - 1792 - 11 May - 1871 - English - Mathematician - Astronomer - William Herschel

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John Herschel originated the use of the Julian day system in astronomy and made several important contributions to the improvement of photographic processes (Cyanotype). He coined the terms "photography", "negative", and "positive", and discovered sodium thiosulphate as a fixer of silver halides.

Related Topics:
Julian day - Photographic processes - Cyanotype - Sodium thiosulphate - Halide

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