| Share
 

Dictionary


as'tronom'ical u'nit



Astron.
a unit of length, equal to the mean distance of the earth from the sun: approximately 93 million miles (150 million km). Abbr.: AU

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

astronomical twilightastronomical year
See also:

 

Related Content