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vector222
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- TL;DR Summary
- SR effect GR effect
OK this is a quote from the physics forum site - it is not mine.
So the above quote says that there are two effects which alters the clock ticks, the GR effect and the SR effect for clocks aboard satellites.
We all know that satellite are in free fall and for free fall there must be a steady tangent velocity at a particular orbital distance for the satellite to remain in orbit.
I have read elsewhere that free fall has nothing to do with how a clock ticks (faster or slower)
What am I not understanding?
Chronos said:Yes, the GPS clocks 'tick' faster than those on Earth due lower gravity [GR effect], which is partially offset by their orbital velocity [SR effect]. The net effect is they would run about 39,000 nanoseconds per day faster than their earthbound counterparts. GPS clocks are precalibrated before launch to cause them to run this much slower, and, voila! Once in orbit they are synchronized with ground clocks. Scientists subsequently tweak the calibration of the GPS clocks to keep them in synch with ground clocks.
So the above quote says that there are two effects which alters the clock ticks, the GR effect and the SR effect for clocks aboard satellites.
We all know that satellite are in free fall and for free fall there must be a steady tangent velocity at a particular orbital distance for the satellite to remain in orbit.
I have read elsewhere that free fall has nothing to do with how a clock ticks (faster or slower)
What am I not understanding?
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