Q: Satellites experience less time because they’re moving fast, but more time because they’re so high. Is there an orbit where the effects cancel out? Is that useful?
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How fast would they have to orbit the Earth to cancel out the gravitational time dilation? The thumbnail sketch of time dilation is: fast things and low things experience less time. So satellites above our head experience a little more time because they’re high, but a little less because they’re moving. This speed, v g , is what you use to find how much time is going faster for the satellite. This speed, v s , is what you plug in to find how much time is going slower.