Astronomical unit

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astronomical unit
Unit seestem: Astronomical seestem o units
(Acceptit for uise wi the SI)
Unit o... length
Seembol: au or ua
Unit conversions
1 au or ua in... is equal tae...
   km    149.6×106
   mi    92.956×106
   pc    4.8481×10−6
   ly    15.813×10−6

An astronomical unit (abbreviatit as au;[1] ither abbreviations that are sometimes uised include , a.u. an ua[2]) is a unit o length nou defined as exactly 149,597,870,700 m (92,955,807.3 mi),[3] or roughly the average YirdSun distance.

References[eedit | eedit soorce]

  1. "RESOLUTION B2 on the re-definition of the astronomical unit of length", RESOLUTION B2, Beijing, Kina: International Astronomical Union, 31 August 2012, retrieved 2013-05-11, "The XXVIII General Assembly of International Astronomical Union recommends [adopted] … that the unique symbol “au” be used for the astronomical unit." 
  2. Bureau International des Poids et Mesures (2006), The International System of Units (SI) (8th ed.), Organisation Intergouvernementale de la Convention du Mètre, p. 126 
  3. "RESOLUTION B2 on the re-definition of the astronomical unit of length", RESOLUTION B2, Beijing, Kina: International Astronomical Union, 31 August 2012, retrieved 2012-09-19, "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 149 597 870 700 meters, in agreement with the value adopted in IAU 2009 Resolution B2"