Layman alert!
Okay, so from what little I understand of the theory of relativity, time goes slower for you the closer you get to the speed of light. I've never been able to wrap my head around WHY this is, but there it is.
Has anyone ever bothered to calculate how much the various speeds the Earth is moving (rotation, revolution around the sun, revolution around the galactic center, the galaxy's motion through space) affect our local timeflow, as opposed to if we were sitting perfectly still the way some fundies think we are?