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if one observer A is at rest, its clock measures proper time. Observer A could look at the clock on a spacecraft moving at a large fraction of the speed of light and see that the clock on the spacecraft ticks more slowly, leading to time dilation...

To look at that clock in the spacecraft, the clock is placed by one of the windows of the spacecraft....

The acting of seeing, looking at that clock on the spacecraft implies that light is going from the spacecraft to observer A.....

So if observer A and observer B (on the spacecraft) looked at each other and at each other clocks through one of the spacecraft windows, they would see each clock tick at a different time...Each observer would see the other observer clock tick more slowly....reciprocity...

IS this correct? Am I getting the concept right?

thanks

fisico30

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# Basic time dilation question do I really understand it?

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