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mfb- t1_j9zhfoe wrote

GPS satellites run on a slightly different clock frequency to compensate the average time dilation. They do smaller adjustments once in a while because clocks on Earth are more precise.

The ISS has GPS satellites in view all the time so it can simply get the time from there.

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EmergencySwitch t1_ja02vfx wrote

EDIT: did not realize you were only correcting the misconception the first part.

This is not the time the clocks show. This is about the age of the things in the ISS compared to earth

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