UNITS A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z                    HOME ABOUT CATEGORIES SITE MAP COPYRIGHT ADVERTISE CONTACT entire Web this site astronomical unit (AU) The mean distance between the Earth and the Sun. 1 AU = 149,597,870 kilometers = 92,955,806 miles = 499 light-seconds. One light-year equals 63,240 AU. Related category    • UNITS Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) BACK TO TOP