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A Writer's Dictionary:

parsec Definition


Dictionary Home » Words Starting with P » Parmesan cheese ... partial tone » parsec


parsec
noun
    1. astron.
      A unit of astronomical measurement equal to 3.26 light years or 3.09 ′ 1013km, being the distance at which a star would have a parallax of 1 second of arc when viewed from two points which are the same distance apart as the Earth is from the Sun.
Etymology: Early 20c: from parallax + second2.



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