Shaku was standardized to exactly 10/33 meters (SI base unit). Originally based on the length of the forearm this unit may also be referred to as a Japanese foot. 1 Shaku ? 11.93 in ? 0.9942 ft ? 0.30303 m.
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.