Absolute magnitude from an absolute magnitude in a specific filter band to absolute bolometric magnitude, a bolometric correction is applied. For Solar System bodies that shine in reflected light, a different definition of absolute magnitude (H) is used, based on a standard reference distance of one astronomical unit. In stellar and galactic astronomy, the standard distance is 10 parsecs (about 32.616 light-years, 308.57 petameters or 308.57 trillion kilometres). A star at 10 parsecs has a parallax of 0.1″ (100 milliarcseconds). Galaxies (and other extended objects) are much larger than 10 parsecs, their light is radiated over an extended patch of sky, and
Two miles Kenyan Daniel Komen in Hechtel, Belgium on 19 July 1997. The women's record is 8:58.58, set by Ethiopian Meseret Defar in Brussels, Belgium on 14 September 2007. Note: this list only covers boys because the history of 2 mile running largely occurred before Title IX, before high school girls were allowed to compete, which occurred about the same time as conversion to metric distances. Two miles The 2 mile (10,560 feet or exactly 3,218.688 metres) is a historic running distance. Like the mile run, it is still contested at some invitational meets, perhaps because it provides an easier record to