It's all very simple
Light is a constant (or isn't) by which we measure time. Therefore time is a constant (or not). The relation of time and speed (ie light) allows us to measure distance. Which is a constant. (or not, depending on light and time). This means you might be about 3 feet away from me. In which case go away.
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Sun 23 Dec 2007, 23:54,
archived)
If you are driving your car at night
at the speed of light and turn on the headlights . . . what happens ?
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Mon 24 Dec 2007, 0:05,
archived)