• Contents
  • Welcome
  • Introduction
  • Phenomena (incl. eclipses)
  • Time-Scales and Coordinate Systems
  • Sun
  • Moon
  • Planets
  • Natural Satellites
  • Dwarf Planets and Small Solar System Bodies
  • Stars and Stellar Systems
  • Observatory Search
  • Tables and Data
  • Notes and References
  • Glossary
• Errata
  • Errata 2015
  • Errata 2014
  • Errata 2013
  • Errata 2012
  • Errata 2011
  • Errata 2010
  • Errata 2009
  • Errata 2008
  • Errata 2007
  • Errata 2006
  • Errata 2005
  • Errata 2004
  • Errata 2003
  • Errata 2002
  • Errata 2001
• Constants
• Glossary
• Utilities
  • Planetary Geocentric Coordinates
• Additional Info
  • Additional Resources
  • Noted Links
  • Contributors
  • Ordering
  • Legal
  • Contact Us

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.

• 2017 Selected Astronomical Constants in PDF and ASCII format
• 2016 Selected Astronomical Constants in PDF and ASCII format
• 2015 Selected Astronomical Constants in PDF and ASCII format
• 2014 Selected Astronomical Constants in PDF and ASCII format
• 2013 Selected Astronomical Constants in PDF and ASCII format
• 2012 Selected Astronomical Constants in PDF and ASCII format
• 2011 Selected Astronomical Constants in PDF and ASCII format
• 2010 Selected Astronomical Constants in PDF and ASCII format
• 2009 Selected Astronomical Constants in PDF and ASCII format
• 2008 Selected Astronomical Constants in PDF and ASCII format
• 2007 Selected Astronomical Constants in PDF and ASCII format
• 1976 IAU Constants in PDF