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parsec

parsec (pär´sĕc) [parallax + second], in astronomy, basic unit of length for measuring interstellar and intergalactic distances, equal to 206,265 times the distance from the earth to the sun, 3.26 light-years, or 3.08 × 1013 km (about 19 million million mi). The distance in parsecs of an object from the earth is the reciprocal of the parallax of the object. The nearest star, Proxima Centauri, has a parallax of 0.763″ of arc and a distance of about 1.31 parsecs.

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"parsec." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 18 Oct. 2017 <http://www.encyclopedia.com>.

"parsec." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (October 18, 2017). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/parsec

"parsec." The Columbia Encyclopedia, 6th ed.. . Retrieved October 18, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/parsec

parsec

par·sec / ˈpärˌsek/ (abbr.: pc) • n. a unit of distance used in astronomy, equal to about 3.25 light years (3.08 × 1016 meters). One parsec corresponds to the distance at which the mean radius of the earth's orbit subtends an angle of one second of arc.

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"parsec." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. 18 Oct. 2017 <http://www.encyclopedia.com>.

"parsec." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (October 18, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/parsec

"parsec." The Oxford Pocket Dictionary of Current English. . Retrieved October 18, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/parsec

parsec

parsec (pc) Distance at which a star would have a parallax of one second of arc; equivalent to 3.2616 light years, 206,265 astronomical units, or 3.0857 × 1013 km.

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"parsec." World Encyclopedia. . Encyclopedia.com. 18 Oct. 2017 <http://www.encyclopedia.com>.

"parsec." World Encyclopedia. . Encyclopedia.com. (October 18, 2017). http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/parsec

"parsec." World Encyclopedia. . Retrieved October 18, 2017 from Encyclopedia.com: http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/parsec