Explorable
How much does your clock drift at this altitude?
Slide a clock from sea level to geostationary orbit and watch gravity speed it up, speed slow it down, and the two cancel for orbits about 3,170 km up.
HEIGHT (GR) · PER DAY+45.7 μs
SPEED (SR) · PER DAY−7.11 μs
NET · PER DAY+38.6 μs
NET · PER YEAR+14.1 ms
LIGHT TRAVELS, IN 1 DAY’S GAIN11.6 km
A clock in a circular orbit at 20 182 km runs fast by 38.6 μs a day compared with a clock at sea level.
The physics, the assumptions behind this tool and the sources are explained in Time runs faster above your head: relativity in GPS.