An astronomical measurement of distance (usually measuring distance to stars,) equal to about 3.2616
Light years, or about 3.08568×10^16
m (about 30,856,800,000,000,000 meters). Not a measurement of time. Derives from "PARallax of one SECond of
arc."
Han Solo: "You never heard of the Milennium Falcon? She
made the Kessel Run in less than 12 parsecs!" Silly
George Lucas, leave the big scientific terms to Asimov and Clarke.