Unit of distance at which a star would have a parallax of 1 second of arc from a planet of exactly 1 astronomical unit (AU) distance from its primary. One parsec is equal to 3.262 light-years, 2.063x105 AU, or 3.085678 x1013 kilometers.
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  • AU (Astronomical Unit) - Text by M. Alan Kazlev
    Astronomical Unit - the mean distance of the Earth to the Sun (SolSys), about 1.496 x 108 km (150 million km), 8.3 light minutes, 1.582x10-5 light years, or 4.847x10-6 parsecs. Standard interplanetary measurement.
  • Light-year - Text by M. Alan Kazlev
    The distance light travels in one standard or metric (Earth) year, viz. 9.46x1012 km. Standard unit of measurement. It is equal to 6.323x104 astronomical units (AU) or 0.307 parsecs.
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Development Notes
Text by M. Alan Kazlev
Initially published on 19 December 2001.