Awasome Speed Of Light Parsecs Per Year References. The parsec unit is obtained by the use of parallax and trigonometry, and is defined as the distance at which 1 au subtends an angle of one arcsecond (1/3600. Since light travels at a speed of approximately 186,282 miles per second (299,792,458 meters per second), a light year is a significant distance — about 5.88.web

63,240 astronomical units, au, where one au is equal to 1.5*10^8 km ; 1 speed of light [water] to parsecs/year = 0.23052 parsecs/year. The parsec is a unit of length equivalent to around 20 trillion (20,000,000,000,000) miles, 31 trillion kilometres, or 206,264 times the distance from the earth to the sun.















