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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
...better precision than the previous value determined by Ole Christensen Romer in 1676. He used a beam of light reflected from...
 Contemporaries
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Ole Christensen Romer1644, Sep 251662
 
17101710, Sep 19
Ismael Bullialdus1605, Sep 281632
 
16671694, Nov 25
 a famous astronomer and mathematician during the seventeenth century. He published several books,...
Adrien Auzout1622, Jan 281640
 
16691691, May 23
 a French astronomer. Auzout made contributions in telescope observations, including perfecting th...
Giovanni Battista Riccioli1598, Apr 171628
 
16711671, Jun 25
 an Italian astronomer and a Catholic priest in the Jesuit order. He is known, among other things,...
George Hartgillunknown1590
 
168unknown
 an English astronomer. Hartgill was in considerable repute during Elizabeth I's reign, from his k...
Johannes Hevelius1611, Jan 281630
 
16831687, Jan 28
 an astronomer he gained a reputation as "the founder of lunar topography" and described ten new c...
Giovanni Cassini1625, Jun 81648
 
16831712, Sep 14
 an Italian mathematician, astronomer, astrologer and engineer, born in Perinaldo, known for his w...
Christoph Arnold1650, Dec 171683
 
 
16921695, Apr 15
 a German amateur astronomer. Born in Sommerfeld near Leipzig, Arnold was a farmer by profession. ...
Christiaan Huygens1629, Apr 141649
 
16931695, Jul 8
 a prominent Dutch mathematician, scientist, astronomer, physicist, probabilist and horologist. Hi...
John Flamsteed1646, Aug 191662
 
17191719, Dec 31
 an English astronomer and the first Astronomer Royal. His main achievements were the preparation ...
Maria Margarethe Kirch1670, Feb 251690
 
17191720, Dec 29
 a German astronomer, and one of the first famous astronomers of her period due to her writings on...
Isaac Newton1642, Dec 251665
 
17261726, Mar 20
 an English physicist and mathematician (described in his own day as a "natural philosopher") who ...
Jiao Bingzhen16891700
 
17261726
 a noted painter and astronomer. In painting he is noteworthy as one of the first Qing dynasty pai...
Jacques d'Allonville1671, Jul 141692
 
17281732, Sep 10
 an astronomer and mathematician. He concluded in his measurements taken during his stay in Marsei...
Jacques Cassini1677, Feb 181696
 
17401756, Apr 16
 a French astronomer, son of the famous Italian astronomer Giovanni Domenico Cassini. He published...
Edmond Halley1656, Nov 81675
 
17421742, Jan 14
 an English astronomer, geophysicist, mathematician, meteorologist, and physicist who is best know...
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