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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.
1 Parallax-The parallax of a star is the angle subtended at the star by the radius of the Earth's orbit (Figure 02). 2  Distance to the star can be computed by the formula: 3  d = 206265/p. 4  where the distance d is in unit of a.u., and the parallax p in second of arc.