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Par sec is nothing but a unit of distance in astronomy which is equal to about 3.26 light year (3.086 x 10 to the power 13  km ). 1 par sec responds to the to the distance at which the mean radius of the earth's orbit subtends an angle of 1 sec of arc.
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A parsec (symbol: pc) is an astronomical unit of length used to measure distances to objects outside the Solar System .
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