**B. Average distances of a planet from the focus of ellipse**

There are three average distances of a planet from the star can be calculated averaged in: (a) the angle *θ*; (b) time; and (c) arc length *s* [62]. The formula (6) for the planet distance from the ellipse focus, according to Kepler's third law, can be rewritten as follows:

$$d = \frac{P\_e}{1 - e \cos \theta}.\tag{10}$$

where *Pe* <sup>¼</sup> *<sup>a</sup>* <sup>1</sup> � *<sup>e</sup>*<sup>2</sup> ð Þ.

*Millennial Oscillations of Solar Irradiance and Magnetic Field in 600–2600 DOI: http://dx.doi.org/10.5772/intechopen.96450*
