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to **Kepler's Applet**

**Movie
of elliptical motion**

**Plots
of elliptical Kepler motion**

The JavaScript form is preset to the values: eccentricity e=0.5 The results are, as shown in the figure below: true anomaly phi=75.84° A series expansion of the true anomaly φ can be found here or in Meeus (Astronomical Algorithms, Chapter 3): It is suitable only for small values of the eccentricity e. |

(c) 2006 J. Giesen