Before the 17th century scientists believed that there was no such thing as the "speed of light". They thought that light could travel any distance in no time at all. Later, several attempts were made to measure that speed.
Effect of gravity on the measured speed of light. Einsteins theory of General Relativity.
When the geocentric frame is inertial 12000 Lunar Orbits/Earth Day becomes equivalent to the speed of light.
Historical measurement of the speed of light
Effect of gravity on the measured speed of light.
Light travels in one day the same distance the moon travels in 1000 years.
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