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definition  A basic unit of astronomical distances, corresponding to a trigonometric parallax of one second of arc. In other words, it is the distance at which one astronomical unit (the mean radius of the Earth's orbit) subtends an angle of 1 arcsecond. 1 pc = 3.2616 lightyears = 206,265 astronomical units = 30.857 x 10^12 km.  
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contributor  AAS_Frey.Katie_Admin original 