André-Louis Danjon
#42,060
Most Influential Person Across History
French astronomer
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Physics
Why Is André-Louis Danjon Influential?
(Suggest an Edit or Addition)According to Wikipedia, André-Louis Danjon was a French astronomer born in Caen to Louis Dominique Danjon and Marie Justine Binet. Danjon devised a method to measure "earthshine" on the Moon using a telescope in which a prism split the Moon's image into two identical side-by-side images. By adjusting a diaphragm to dim one of the images until the sunlit portion had the same apparent brightness as the earthlit portion on the unadjusted image, he could quantify the diaphragm adjustment, and thus had a real measurement for the brightness of earthshine. He recorded the measurements using his method from 1925 until the 1950s.
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What Schools Are Affiliated With André-Louis Danjon?
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