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The astronomical unit (symbol: au[1][2][3] or ua[4]) is a unit of length, roughly the distance from Earth to the Sun. It is presently defined as exactly 149597870700 metres (about 150 million kilometres, or 93 million miles).[5] The astronomical unit is used primarily as a convenient yardstick for measuring distances within the Solar System or around other stars. It is also a fundamental component in the definition of another astronomical length, the parsec.

ReferencesEdit

  1. International Astronomical Union, ed. (31 August 2012), "RESOLUTION B2 on the re-definition of the astronomical unit of length", RESOLUTION B2, Beijing, China: International Astronomical Union, "The XXVIII General Assembly of International Astronomical Union … recommends … 5. that the unique symbol "au" be used for the astronomical unit." 
  2. "Monthly Notices of the Royal Astronomical Society: Instructions for Authors". Oxford Journals. http://www.oxfordjournals.org/our_journals/mnras/for_authors/#6.4%20Miscellaneous%20journal%20style. Retrieved on 2015-03-20. ""The units of length/distance are Å, nm, µm, mm, cm, m, km, au, light-year, pc." 
  3. "Manuscript Preparation: AJ & ApJ Author Instructions". American Astronomical Society. http://aas.org/authors/manuscript-preparation-aj-apj-author-instructions#_Toc2.2. Retrieved on 2016-10-29. ""Use standard abbreviations for SI... and natural units (e.g., au, pc, cm)."" 
  4. ISO 80000-3, Quantities and units – Space and time
  5. International Astronomical Union, ed. (31 August 2012), "RESOLUTION B2 on the re-definition of the astronomical unit of length", RESOLUTION B2, Beijing, Kina: International Astronomical Union, "The XXVIII General Assembly of International Astronomical Union recommends [adopted] that the astronomical unit be re-defined to be a conventional unit of length equal to exactly Template:Val metres, in agreement with the value adopted in IAU 2009 Resolution B2"