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The '''astronomical unit''' is a unit of measurement equivalent to ([[AU]]) the mean distancce between the [[Sun]] and [[Earth]]. The AU is used widely in expressing distances in the solar system. 1 AU = 149,597,870.691 km<ref>[http://www.iau.org/public/measuring/ The IAU and astronomical units] - International Astronomical Union site</ref>, or approximately 93 million miles. <!-- which mile? landmine, nautical mile, roman mile? //-->

The '''astronomical unit''' is a unit of measurement equivalent to ([[AU]]) the mean distance between the [[Sun]] and [[Earth]]. The AU is used widely in expressing distances in the solar system. 1 AU = 149,597,870.691 km<ref>[http://www.iau.org/public/measuring/ The IAU and astronomical units] - International Astronomical Union site</ref>, or approximately 93 million miles. <!-- which mile? landmine, nautical mile, roman mile? //-->

== References ==

== References ==