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Parallax is defined as an object appearing as if it is positioned differently when it is looked at from different angles or different positions.
Stellar parallax motion from annual parallax. Stellar parallax is the basis for the parsec, which is the distance from the Sun to an astronomical object that has a parallax angle of one arcsecond. (1 AU and 1 pc are not to scale, 1 pc = ~206265 AU)