Astronomical Constants

Selected astronomical constants are given along with their associated references. Included are values used in the production of The Astronomical Almanac. In some cases, differing sources yield differing values; in those instances more than one value may be given.

 
  • 2013 Selected Astronomical Constants in PDF or ASCII
  • 2012 Selected Astronomical Constants in PDF or ASCII
  • 2011 Selected Astronomical Constants in PDF or ASCII
  • 2010 Selected Astronomical Constants in PDF or ASCII
  • 2009 Selected Astronomical Constants in PDF or ASCII
  • 2008 Selected Astronomical Constants in PDF or ASCII
  • 2007 Selected Astronomical Constants in PDF or ASCII
  • 1976 IAU Constants in PDF
The Astronomical Almanac Online! 2013