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RE: Round earth theory vs flat earth theory
Stars do "move" through the night sky as the earth rotates. This can easily be viewed by overexposing a camera to the night sky. You see star trails (the path the star takes during the exposure):
You can also see different constellations at different times of year due to the earth's revolving around the sun.
Image Source: https://pixabay.com/en/star-trails-night-long-exposure-828656/
I know they move position but what i am meaning is like 100 years ago they would see the same stars in the same positions we do today. Yet if everything is moving trough space at diffetent speeds and orbits how can we still see the same stars they would have to change?
The stars do move, but they're so far away that it would take thousands of years to be noticeable to the human eye. Astronomers can observe this movement by analyzing the shift in the wavelength of light emitted by the stars. Check the link below for a thorough.
https://www.quora.com/Do-stars-move-or-not