Everyone, do not panic. The earth’s axis precesses http://en.wikipedia.org/wiki/Axial_precession_(astronomy) in a cycle that is about 25,000 years. That is what drives the changes in the astrological ages, like from Pisces to the Age of Aquarius, which, as we all remeber from the song, we are in the dawn of. The axis tilt is what gives us winter and summer, so it would make sense that the wobble around the axis would also affect climate.
That’s precession, in other words the speed the Zodiac signs change re: the day of the year.
From Wiki, talking about axial tilt:
scillates between 22.1 and 24.5 degrees on a 41,000-year cycle. It is currently 23.44 degrees and decreasing.