Louis Fizeau

Armand Hippolyte Louis Fizeau FRS FRSE MIF (French pronunciation: [aʁmɑ̃ ipɔlit lwi fizo]; 23 September 1819 – 18 September 1896) was a French physicist, who in 1849 measured the speed of light to within 5% accuracy.

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The first photos of the Sun were taken in 1845 by French physicists Louis Fizeau and Lion Foucault. In the 1860s, Warren de la Rue recorded the complete 11 year solar cycle in a series of almost 3000 images that clearly showed sunspots and other features