--- units.dat	2004-10-19 09:37:24.802027245 +0200
+++ units.dat.new	2004-10-19 09:37:19.665715964 +0200
@@ -1380,6 +1380,7 @@
                                         #   actual mean distance is slightly
                                         #   larger because the earth's mass is
                                         #   not negligible.  
+au			1 astronomicalunit
 sundist                 1.0000010178 au # mean earth-sun distance
 moondist                3.844e8 m       # mean earth-moon distance
 sundist_near            1.471e11 m      # earth-sun distance at perihelion