Submitted by [deleted] t3_zu704d in askscience
[deleted] OP t1_j1izbek wrote
[deleted]
PatrickKieliszek t1_j1j3wii wrote
Gravity causes time to run more slowly. Speed also causes time to run more slowly.
On the surface of the Earth, we have higher gravity. This causes our clocks to run slower.
The ISS is moving much faster than we are. This causes their clocks to run slower.
The ISS is not that high up and it it moving VERY fast. The slowing effect from their high speed is greater than the slowing effect from our higher gravity.
Their clocks run ever so slightly slower than ours.
Octavus t1_j1j7ik4 wrote
Wikipedia has a handy graph showing the effect of general and special relativity for orbiting satellites in circular orbits. This highlights what you and others are describing.
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