symbols, acronyms & abbreviations

au

astronomical unit.

The BIPM attempted to assign the symbol “ua” to the astronomical unit¹; however, that was not accepted by the astronomers.

1. Barry N. Taylor and Ambler Thompson, editors.
The International System of Units (SI) pdf logo
NIST Special Publication 330, 2008 Edition.

“United States version of the English text of the eighth edition (2006) of the International Bureau of Weights and Measures publication Le Système International d’ Unités (SI)” This publication is the definitive guide for the United States, but the ultimate authority is the original, French version. See table 7, page 34.

authority

5. que le seul symbole “au” soit utilisé pour l’unité astronomique.

Résolution UAI 2012 B2: Version française.
Proposée par le Groupe de travail UAI sur les « Standards numériques en Astronomie fondamentale »
Soutenue par la Division I
Re-définition de l’unité astronomique de longueur.
La XXVIIIe Assemblée générale de l’Union astronomique internationale.

Resolution B2 on the re-definition of the astronomical unit of length. Proposed by the IAU Division I Working Group Numerical Standards and supported by Division I.
The XXVIII General Assembly of the International Astronomical Union, … recommends … 5. that the unique symbol “au” be used for the astronomical unit.

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