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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 is. a. the apparent motion of an object due to the motion of the observer. b. the distance between two foci of an ellipse. c. the small circle that the planets slid along in Ptolemy's geocentric universe. d. the circular orbits used in Copernicus' heliocentric universe.