Quote:
Originally Posted by peacegirl
If we're using the speed of light to determine the location of the planet, and we've also determined the speed of light from the moons of Jupiter experiment, could it be that the calculation as to how fast light is traveling could be slightly off?
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The Moons of Jupiter were one of the early indicaters that light traveled at a finite speed, and allowed observers to estimate that speed. Since then there have been other tests that have confirmed the original estimate and have made that figure much more accurate. The Moons of Jupiter are not the only means we have to check the speed of light, if that were so it would be useing the observation to prove itself, and science doesn't work that way.