Parsec Parsec The parsec (symbol: pc) is a unit of length used to measure large distances to astronomical objects outside the Solar System. A parsec is defined as the distance at which one astronomical unit subtends an angle of one arcsecond, which corresponds to astronomical units. One parsec is equal to about 3.26 light-years (30 trillion km or 19 trillion miles) in length. The nearest star, Proxima Centauri, is about from the Sun. Most of the stars visible to the unaided eye in the night sky are within 500 parsecs of the Sun. The parsec unit was probably first suggested in
Grimthorpe Handicap Chase Grimthorpe Handicap Chase The Grimthorpe Handicap Chase is a National Hunt handicap steeplechase in England which is open to horses aged five years or older. It is run at Doncaster over a distance of about 3 miles and 2 furlongs and during the race there are 19 fences to be jumped. The race is scheduled to take place each year in late February or early March. Prior to the early 1980s the Grimthorpe Chase was run over two miles and 150 yards. The distance was then upped dramatically nearly doubling to a stamina testing four miles and 100 yards. The