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As the Earth orbits the sun, it's rotational axis precesses. This precession, or wobble is caused by the gravitational influence of the Sun and the Moon. The result is a continuous change in the orientation of the Earth's axis. It also changes the apparent position of the Sun with regards to the background stars. Since the Earth precesses about once every 25,800 years, there needs to be, and should be, a correction of one day every 78 years to those signs. Some astrologers correct for this, most don't.