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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.
parallax. n. 1. (General Physics) an apparent change in the position of an object resulting from a change in position of the observer. 2. (Astronomy) astronomy the angle subtended at a celestial body, esp a star, by the radius of the earth's orbit. Annual or heliocentric parallax is the apparent displacement of a nearby star resulting from its observation from the earth. Diurnal or geocentric parallax results from the observation of a planet, the sun, or the moon from the surface of the earth.