The phenomenon that Alicia is perceiving as the stars appearing to switch locations across the sky as the night progresses is known as apparent motion.
Apparent motion when we perceive real motion from a series of still images, that is to say, we see motion where there is no motion. The Earth rotates on its axis every day. This rotation can explain why Alicia and many other stargazers perceive the stars as though they were moving across the night sky. This apparent motion depends on the relation between the observer's location and the location of the star as the Earth rotates.
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