Parallax – Wikipedia

Parallax (from Ancient Greek παράλλαξις (parallaxis), meaning ‘alternation’) 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.[1][2] Due to foreshortening, nearby objects show a larger parallax than farther objects when observed from different positions, so parallax can be used to determine distances. To measure large distances, such as the distance of a planet o

Source: Parallax – Wikipedia

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