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The apparent angular displacement of an object (especially a star) due the motion of the Earth in its orbit.
Barnard's star has the largest proper motion known, 10.27" a year. Bessel  was the first to measure a
star's parallax, thus obtaining the first direct measurement the distance to a star.
 Parsec, Proper Motion
Duffett-Smith, P. "Geocentric Parallax and the Figure of the Earth" and "Calculating Corrections for Parallax."
§38-39 in Practical Astronomy with Your Calculator, 3rd ed.
Cambridge, England: Cambridge University Press, pp. 66-71, 1992.
Montenbruck, O. and Pfleger, T. "Parallax and Refraction." §3.5 in Astronomy on the Personal Computer, 4th ed.
Berlin: Springer-Verlag, pp. 44-47, 2000.
© 1996-2007 Eric W. Weisstein
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