7277884 Christiaan Huygens, 14 April 1629, 8 July 1695, also Christianus Hugenius, Dutch astronomer by Unknown Artist, (19th century); Private Collection; (add.info.: Christiaan Huygens, 14 April 1629, 8 July 1695, also Christianus Hugenius, Dutch astronomer, mathematician and physicist, digitally restored reproduction of a 19th century original); © Imagebroker.
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