  Context. Many algorithms to solve Kepler's equations require the evaluation
of trigonometric or root functions.
  Aims. We present an algorithm to compute the eccentric anomaly and even its
cosine and sine terms without usage of other transcendental functions at
run-time. With slight modifications it is applicable for the hyperbolic case,
too.
  Methods. Based on the idea of CORDIC, it requires only additions and
multiplications and a short table. The table is independent of eccentricity and
can be hardcoded. Its length depends on the desired precision.
  Results. The code is short. The convergence is linear for all mean anomalies
and eccentricities e (including e = 1). As a stand-alone algorithm, single and
double precision is obtained with 29 and 55 iterations, respectively. One half
or two third of the iterations can be saved in combination with Newton's or
Halley's method at the cost of one division.

Instrumentation and Methods for Astrophysics;Earth and Planetary Astrophysics;Solar and Stellar Astrophysics