The following books provide fundamental equations used in celestial mechanics.

• “Explanatory Supplement to the Astronomical Almanac”, ed. P. K. Seidelmann, 1992, University Science Books.
• “Fundamentals of Astrodynamics”, R.R. Bate, D.D. Mueller, J.E. White, 1971, Dover Publications, Inc.
• “Fundamentals of Celestial Mechanics”, J.M.A. Danby, 1992, Willmann-Bell.
• “Methods of Orbit Determination for the Micro Computer”, D. Boulet, 1991, Willmann-Bell.
• “Orbital Mechanics”, J.E. Prussing, B.A. Conway, 1993, Oxford University Press.
• “Orbits for Amateurs with a Microcomputer”, D. Tattersfield, 1984, Halsted Press.
• “Spherical Astronomy”, R. M. Green, 1985, Cambridge University Press.
• “Vectorial Astrometry”, C.A. Murray, 1983, Adam Hilger Ltd.

The above list is not necessarily complete nor intended to imply any endorsement by JPL or Caltech.