Dr. Percy Seymour has come closer than anyone to proving the reality of astrological forces - it's an excellent, in-depth, referenced and glossarised article.

His theory includes a proposal that the regular magnetic reversal of the Sun's field, which occurs roughly every eleven years, is due to the tidal effects of Jupiter, Saturn, Uranus, and Neptune. The Sun itself actually moves about the common center of mass of the solar system with a period of just over ten years, and this is mainly due to the pull of Jupiter and Saturn. By violently tugging on the common center of the mass of the solar system, Jupiter, Saturn, Uranus, and Neptune cause the little eddy currents that generate the Sun's magnetic field to reverse or flip over from being in one direction to being in another direction.