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Marcel Gilles Jozef Minnaert (born Feb. 12, 1893, Bruges, Belg.—died Oct. 26, 1970, Utrecht, Neth.) was a Flemish astronomer and solar physicist who pioneered in solar spectrophotometry and showed how such a technique could reveal much about the structure of the Sun’s outer layers. Minnaert was first a botanist, but his desire to understand more fully the effect of light on plants led him to study physics at the University of Leiden, in the Netherlands....