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parsec, pc
1. A unit of length equal to the distance at which the mean radius of the earth's orbit subtends an angle of one second of arc.
2. A unit used with reference to distances to stars and galaxies.

One parsec is equal to 3.2616 light-years, 2.063 x 105 astronomical units, and 3.086 x 1013 kilometers.

This entry is located in the following unit: Astronomy and related astronomical terms (page 18)