page 37, You and the Universe: precession of equinoxes
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Precession of Equinoxes: a 25,868 year cycle of motion in the Earth's axis of rotation, caused by gravitational pulls from Sun and Moon, ...
Precession of Equinoxes (see page 92): Since the Earth is not a perfect sphere (see "oblateness"), the Sun and Moon pull on it unevenly.
This slight movement is known as the precession of Equinoxes. The zodiac, which reckons the first degree of Aries from the equinoctial point, which has a precession every year, is the movable zodiac or Sayana adopted by the western astrologers.
Zodiacal signs beginning with the zero degree of Aries taking into account the precession of equinoxes.
TUNGA-HRASH ...
I'm going to leave it to the experts (see links below) to explain the how and why of this phenomenon, but the long and short of it is that the Precession of Equinoxes is a cycle taking a whopping 25,920 years to complete.
 See also: Equinoxes, Precession, Equinox, Precess, Sun
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