A Smoot is a non-standard unit of measure based on a 1958 MIT prank. In SI units 1 Smoot is equal to 1.70180 meters, the length of Oliver R. Smoot in 1958 when he lay repeatedly end to end to measure the length of the Harvard bridge.
1 Parsec is approximately 3.085 677 82 x 1016 ±6 x 106 meters (SI unit). Approximately 3.26 light years. Distance from the Sun to an astronomical object with a parallax angle of one arcsecond.