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