Definitions
astronomical unit Tweet Definition of astronomical unit Like Definition of astronomical unit on Facebook
noun 
  1. (astronomy) The mean distance from the Earth to the Sun (semi-major axis of Earth's orbit). Approximately 149,600,000 kilometres (symbol AU), used to measure distances in the solar system. By definition, when used to describe the motion of bodies within solar system, solar systems, the heliocentric gravitational constant is equal to (0.017 202 098 95)² AU³/d² (IERS Conventions (1996), D. D. McCarthy? ed., IERS Technical Note 21, Observatoire de Paris, July 1996); hence 1 AU = 149,597,870,691±30 km.
Translations: 
  • French: unité astronomique
  • German: Astronomische Einheit

Supplemental Details:Sponsor an extended definition for astronomical unit for as little as $10 per month. Click here to contact us.

     
  

 Find:
  Words Starting With:
  Words Ending With:
  Words Containing:
  Words That Match:

 
 Translate Into:
  
Dutch   French   German
  
Italian   Spanish
    Show results per page.

Browse the Dictionary
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

   
Dictionary content provided from Wiktionary.org under the GNU Free Documentation License
Allwords Copyright 1998-2019 All rights reserved.