Stars exhibit proper motion. They move relative to other stars in the sky, albeit very slowly. Due to its proper motion, in 1992, the star Rho Aquilae crossed the boundary of its original constellation, Aquila, to the neighboring Delphinus.
Constellations appear the same for years, and flat-Earthers wrongly use it as “evidence” stars are stationary. In reality, with precise measurements, we know the stars are moving.
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Proper motion is the apparent motion of stars, caused by the movement of the stars themselves, relative to the solar system. Stars will appear to shift over time, relative to other, more distant stars.
Flat-Earthers assume stars are only in motion around Polaris, or the north celestial pole. They are wrong. Stars have other apparent movements, one of which is proper motion.
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