A parsec (symbol: pc) is a unit of lenght used in astronomy. The word "parsec" derivates from "parallax of one arc second" and is the result of the method of trigonometric parallax.

One parsec corresponds to:

  • 360 × 60 × 60/(2π) = 206,264.8062 AU
  • 3.085 677 58 × 1016 m
  • 1.917 351 16 × 1013 miles
  • 3.261630751 light-years

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