Fig. C.1


Reference frame employed.  { ui }  is the basis of the equator J2000 reference frame (explained in the text). Ob represents the position of the solar center of mass, which we chose as origin. For convenience, we introduced a new coordinate frame (Ob,  { ei } ). This system uses as z-axis the solar rotation axis Ω. Here δ and α are the declination and right ascension of the solar rotation axis at epoch J2000.

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