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Precession Note 12 Precession – slight “wobble” in Earth’s axis of rotation that traces a cone over a period of 26,000 years Why does Earth “wobble”? - Earth’s rotation on axis causes equatorial regions to slightly bulge out (like a skater’s skirt as she spins rapidly) - Sun & moon exert a gravitational “tug” on bulge trying to align it with the Ecliptic Plane The Plane of the Ecliptic is an imaginary “slice” of the solar system that most planets line up with (Pluto excepted) - This tug & rotational motion of Earth on its axis causes Earth to wobble about its axis of rotation - So our North star will not always be Polaris (in about 13,000 years, North will point to Vega) Zodiac and Equinoxes - all zodiac signs lie on or near the plane of the ecliptic - according to astrology, a person’s sign is determined by the position of the sun on the date they were born - your sign should be the constellation that was behind the sun when you were born - currently there are 12 signs used in astrology but there are actually 13 that lie on the plane of ecliptic - Ophiucus lies between Scorpio and Sagittarius but is not used - sign dates were set up so the Vernal Equinox is when Aries “enters” (is behind) the sun - however, because of Precession, Aries is no longer behind the sun at the Vernal Equinox (Pisces is) Next time you read a horoscope, think about that!!! If you have ever heard the song, Age of Aquarius – It says “This is the dawn of the age of Aquarius” That's true. Because of Precession, Aquarius is almost behind the sun at the equinox