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Light-time correction
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==Discovery== The effect of the finite speed of light on observations of celestial objects was first recognised by [[Ole Rømer]] in 1675, during a series of observations of [[eclipse]]s of the [[moons of Jupiter]]. He found that the interval between eclipses was less when Earth and Jupiter are approaching each other, and more when they are moving away from each other. He correctly deduced that this difference was caused by the appreciable time it took for light to travel from Jupiter to the observer on Earth.
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