aramis720 Posted August 25, 2017 Share Posted August 25, 2017 I've read various accounts of the GPS that invoke both SR and GR in making required adjustments, but this use of both SR and GR confuses me. SR applies only in inertial frames and GR in all frames. Inertial frames don't actually exist in nature b/c there's always some kind of gravitational field present, even in empty space, so strictly speaking SR should never apply in the real world. But we still use it as a useful tool even though we know it doesn't strictly apply. That said, I'm confused why both SR and GR are invoked when it comes to the GPS system b/c it seems that any adjustments that would have to be made would require GR only. Or is SR being used for some adjustments b/c its math is so much easier? Any help clarifying these issues would be appreciated. Link to comment Share on other sites More sharing options...
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