Parallaxes

Details Parallaxes Parallaxes

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke5213h&link_type=abstract

"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 5213. Bristol: Institute of Physics Publishing, 2001

Astronomy and Astrophysics

Astrophysics

Coordinates, Time, And Motion, Astrometry

Scientific paper

The trigonometric parallax (π) of a star is the angle subtended by 1 astronomical unit (AU) at the star's distance (d) from the Sun (see figure 1). As the Earth annually orbits the Sun, the observer's changing position causes an annual shift in the star's measured position, tracing a small ellipse on the sky that reflects the size and orientation of the Earth's orbit as it might be viewed from t...

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