Eccentric Anomaly, Eric Weisstein's World of Math Kepler's Equation
References
Danby, J. M. Fundamentals of Celestial Mechanics, 2nd ed., rev. ed. Richmond, VA: Willmann-Bell, 1988.
Finch, S. R. "Laplace Limit Constant." §4.8 in Mathematical Constants. Cambridge, England: Cambridge University Press, pp. 266-268, 2003.
