The Twins Paradox: Exploring Time Dilations' Effects

In summary, the conversation discusses the differences between the time dilation effects in the GPS system and the common twins paradox scenario. While both involve time dilation, the GPS system has a real and verifiable time dilation that is asymmetric, while the twins paradox involves an undefined or unverifiable time dilation for the outgoing trip. The conversation also explores the impact of gravity and inertial frames on these scenarios.
  • #71
binis said:
Satellite is almost immobile relative to the center of the Earth

No, it isn't. The 14,000 km/h speed that was given is relative to the center of the Earth.

binis said:
differently to a point on the surface.

A point on the Earth's surface is moving, at most (for a point on the equator) at about 1600 km/h relative to the center of the Earth. So the satellite's speed relative to a point on the Earth's surface isn't that much different from its speed relative to the Earth's center.

binis said:
But "There are no global inertial frames in curved space time."

But there are local ones, and as the reference to the Earth-Centered Inertial (ECI) frame should have told you, it is quite possible to treat a non-rotating frame centered on the Earth's center as inertial to a good enough approximation for many purposes, including the evaluation of the speeds of satellites.

You are hijacking someone else's thread with repeated incorrect comments that add nothing useful to the discussion. As a result, you have now been banned from further posting in this thread.
 
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