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What does apparent movement of a star used to measure its distance from Earth
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What does apparent movement of a star used to measure its distance from Earth

User Huyz
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parallax ........................

User Rare Pleasures
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This is called PARALLAX. Parallax is a displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines.
User Duly Kinsky
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