1644, Sep 251662-17101710, Sep 19
a Danish astronomer who in 1676 made the first quantitative measurements of the speed of light. In Rømer's position as royal mathematician, he introduced the first national system for weights and measures in Denmark on 1 May 1683. In 1700, Rømer persuaded the king to introduce the Gregorian calendar in Denmark-Norway — something Tycho Brahe had argued for in vain a hundred years earlier.
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Hippolyte Fizeau
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Ole Christensen Romer1644, Sep 251662
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