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.
e. half the length of the shortest diameter of an ellipse.


a

Physics & Space Science

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