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How was the speed of light measured in a precise way?

A. by timing how long it takes for an assistant far away to turn on a lantern after the scientist turns one on

B. by watching for eclipses

C. by timing the speed of falling meteorites

D. by using rotating mirrors to measure light's round trip travel to a distant mountain

:O :/,

Answer :

Kalahira
The first successful measurement of the speed of light was done so through the observation of eclipses. Olaus Roemer noticed that depending on the relationship between the Earth, Sun and Jupiter there were varying differences in the times of predicted eclipses.

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