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Niels Bohr Institute > Who, What, When > > Ole Rømer


Ole Rømer (1644-1710) was a Danish astronomer, engineer and civil servant. He was a unique and versatile talent, who accomplished much in his lifetime. However, the achievement that he is especially remembered and is internationally famous for is his discovery of the finite speed of light.

20 September 2011

Read about Ole Rømer’s education >>Ole Rømer’s education
Ole Rømer was born in1644 in Aarhus. In 1662 he moved to Copenhagen to study at the University of Copenhagen.

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28 September 2011

Read about Ole Rømer and the retardation of light >>Ole Rømer and the retardation of light
In 1672 in Paris Ole Rømer made observations of the moons of Jupiter, which led to his discovery of the retardation of light.

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07 February 2012

Ole Rømer in Copenhagen
In January 1681 Ole Rømer returned to Denmark, where he was appointed professor of astronomy at the University of Copenhagen.

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09 February 2012

Observatorium TusculanumObservatorium Tusculanum
In 1681 Ole Rømer set up an observatory in the Round Tower, which he later became the director for in 1686.

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09 February 2012

Read about Ole Rømer’s machines >>

Ole Rømer’s machines
While he lived in Paris, Ole Rømer constructed various astronomical machines such as the Planet machine.

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