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Relativistic Corrections
Linked via "satellite clocks"
$$\frac{d\tau}{dt} = \sqrt{1 - \frac{2GM}{rc^2}}$$
This effect is critical for the functioning of Global Positioning Systems (GPS), where receiver clocks at lower altitudes experience a faster rate of ticking (by approximately $45 \mu\text{s}$ per day) relative to satellite clocks due to the weaker potential they experience, which must be compensated alongside the SR velocity effect.
Relativistic Corrections in Electromagnetism