Parsec is a unit of measurement of length. The definition for parsec is the following:
One parsec is the distance of star with parallax shift of one arc second from a base of one astronomical unit.
The parsec, short for parallax of one arcsecond, is a unit of length used in astronomy, equal to about 31 trillion kilometers or 3.26 lightyears.
The symbol for parsec is
pcParsec is compatible with the
metre base unit.
Please note: The equivalent value of parsec in SI units is an approximation.