As of Version 9.0, unit functionality is built into the Wolfram Language »
Details and Options
- To use AU, you first need to load the Units Package using Needs["Units`"].
- AU is an abbreviation for AstronomicalUnit.
- AU is equivalent to approximately 1.49598*^11 Meter (SI units).
- Convert[n AU,newunits] converts n AU to a form involving units newunits.