Unit of distance at which a star would have a parallax of 1 second of arc from a planet of exactly 1 astronomical unit (AU) distance from its primary. One parsec is equal to 3.262 light-years, 2.063x105 AU, or 3.085678 x1013 kilometers.
- Light-year - Text by M. Alan Kazlev
The distance light travels in one standard or metric (Earth) year, viz. 9.46x1012 km. Standard unit of measurement. It is equal to 6.323x104 astronomical units (AU) or 0.307 parsecs.