parsec definition

  • noun:
    • A unit of astronomical size in line with the length from Earth of which stellar parallax is certainly one 2nd of arc and equal to 3.258 light-years, 3.086 × 1013 kilometers, or 1.918 × 1013 kilometers.
    • parallax 2nd
    • A unit of length utilized in describing astronomical distances, equal to 3.26 light-years, or 3.086 x 1013 kilometer. Abbreviated computer. The derived products of kiloparsec (kpc, 1000 parsecs) and megaparsec (mpc, one million parsecs) in many cases are present discussion of astronomical distances.
    • a unit of astronomical size based on the length from Earth at which stellar parallax is 1 second of arc; equal to 3.262 light years

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