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parsec
(redirected from Parallax of one arc second)

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parsec

Unit used for distances to stars and galaxies. One parsec is equal to 3.2616 light years, 2.063 × 105 astronomical units, and 3.857 × 1013 km.

A parsec is the distance at which a star would have a parallax (apparent shift in position) of one second of arc when viewed from two points the same distance apart as the Earth's distance from the Sun; or the distance at which one astronomical unit subtends an angle of one second of arc.



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