Ole R ø mer (September 25, 1644 - September 19, 1710) was a Danish astronomer.After completing his studies, he entered the Louis XIV government of France to engage in astronomy related affairs, and returned to Denmark in the late 17th century.[1]
Romer's greatest achievement is to discover the speed of light.He worked at the Paris Observatory in France at that time. In 1675, he calculated the time required for light to pass through the earth by observing the difference between the mutual eclipse of Jupiter's satellites and the theoretical value.He thinks it takes less than a second for light to travel around the earth at the speed of 9000 miles.Although this statement was questioned by the director of the Paris Observatory and many scientists, it was supported by Newton, Huygens, Leibniz and others. Later, he calculated the speed of light more accurately for the first time.Later, this method of measuring the speed of light has been used until the so-called rotating gear method, rotating mirror method, Kerr box method, variable frequency flash method and other methods of measuring the speed of light appeared.
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Romer returned to Denmark in his later years to engage in astronomy teaching and other affairs, and now has his own museum in Denmark.
