# 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.

• 2018 Selected Astronomical Constants in PDF and ASCII format
• 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
The Astronomical Almanac Online! 2018