Reference the IAU 2012 definition of the astronomical unit.

Smithsonian · Mar 25, 2024 · 8df870f · 8df870f
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -24,7 +24,8 @@ Changes for the upcoming release of SuperNOVAS, possibly around 1 June 2024. Sta
 
 ### Changes
 
- - Changed definition of `AU` to the IAU definition of exactly 1.495978707e+11 m.
+ - Changed definition of `NOVAS_AU` to the IAU definition of exactly 149597870.7 km (a &lt;10 m change from the 
+   previously defined value).
  - Various corrections and changes to documentation.
 
 

diff --git a/include/novas.h b/include/novas.h
@@ -86,6 +86,7 @@
 #define NOVAS_C                   299792458.0
 
 /// [m] Astronomical unit in meters.  Value is AU_SEC * C. IAU definition.
+/// See <a href="https://www.iau.org/static/resolutions/IAU2012_English.pdf">IAU 2012 Resolution B2</a>.
 #define NOVAS_AU                  1.495978707e+11
 
 /*