It's the old question of "if you're in a spaceship going near the speed of light, and you turn on your headlights...." Think about this: earth is spinning around the sun. The sun is spinning through the Milky Way. The Milky Way is moving away from other galaxies. That's a lot of moving around. Kinda like being in a fast-moving spaceship. If an experiment to measure the speed of light was conducted on Earth, wouldn't the results be skewed a little because of Earth's motion? i mean, if Earth were (just go with it) going near the speed of light, and you turn on a laser (which is moving along with the earth) and fire at a target (also moving, but in relation to the laser appears stationary) in order to measure the speed of light, it seems to me that your results would be a little wacky. Space and time would be warped...right? Now throw in the fact that Earth is moving around the sun, which is moving through a moving galaxy. Who knows how fast all the galaxies in the universe are moving, because nothing in the universe is completely stopped. Is any of this making sense? it seems to me that in order to get a very accurate speed of light, one would have to be completely stationary. But one isn't, is one? Any thoughts? or have i gone and confused myself again?