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how did roemer calculate the speed of light. By timing the eclipses of the Jupiter moon Io Romer estimated that light would take about 22 minutes to travel a distance equal to the diameter of Earths orbit around the Sun. The basic idea uses the orbit of one of Jupiters moons.
Ole Romer And The Speed Of Light Optics Photonics News from www.osa-opn.org
He was then able to roughly calculate how long it took for light to travel across Earths orbit which he worked out was around 22 minutes and determined the speed of light by dividing the. The speed of light in a vacuum stands at exactly 299792458 metres per secondThe reason today we can put an exact figure on it is because the speed of light in a vacuum is a universal. Ole Romer a Danish astronomer calculated the speed of light by observing the eclipses of Jupiters moon during the years 16681674.
In this figure S is the Sun E1 is the Earth when closest to Jupiter J1 and E2 is the Earth about six months later on the opposite side of the Sun from Jupiter J2.
By timing the eclipses of the Jupiter moon Io Romer estimated that light would take about 22 minutes to travel a distance equal to the diameter of Earths orbit around the Sun. Of course his results were inconclusive a conclusion he followed with a smug remark. Video showing how Ole Romer attempted to derive the speed of light. When events transpired as he had predicted Romer explained that the speed of light was such that it takes light 22 minutes to cross the diameter of Earths orbit.
