1 Twip is exactly one twentieth (1/20) of a PostScript point. A PostScript point itself being 1/72 of an inch, making a twip 1/1440 inch. 1 Twip is approximately 1.763889 x 10-5 meters (SI base unit). 1 twp ? 0.000017638888888889 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.