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TeachMeFinance.com - explain Astronomical Unit (AU) Astronomical Unit (AU) The term 'Astronomical Unit (AU)' as it applies to the area of Earth observation can be defined as ' The distance from the Earth to the sun. On average, the sun is 149,599,000 kilometers from Earth'. Previous 5 Terms: Astronomical Dawn Astronomical Dusk astronomical tide Astronomical Unit astronomical unit Next 5 Terms: astronomy astrophysics astroseismology ASTS Asymmetric About the author Mark McCracken Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English". Copyright © 2005-2011 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.