Compared to older, high-orbit communications satellites, why do Starlink units appear to move faster across the sky?
Answer
They orbit in Low Earth Orbit (LEO), which is significantly closer to the planet
Because Starlink satellites orbit much closer (around 550 km) than traditional geosynchronous satellites, they cover more angular distance relative to the observer in the same amount of time.

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Starlink satellites, the string of lights in the night sky. - YouTube
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