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This article discusses one set of techniques used in western astrology. Although there is a common underlying stratum of concepts, no single set of techniques is used by all practitioners of western astrology. Practitioners of chinese astrology or Jyotish (vedic astrology) will use techniques that vary even more from these.

Most astrologers use the tropical zodiac in which the astrological year begins with the vernal equinox when the sun moves into the earth's northern hemisphere. This point is set at 0? of the sign Aries. This is a matter of some dispute with those who would favor the sidereal zodiac that takes into account the precession of the equinoxes. Because of a "wobble" in the earth's axis of rotation over a period of about 26000 years the point at which the vernal equinox advances in the sky by about 50 seconds of arc every year. Advocates of a sidereal zodiac believe that the position of the signs should be fixed relative to the constellations.

The zodiac refers to a band on the celestial sphere containing the signs. It is centered on the plane of the ecliptic, and its width is sufficient to allow for the fact that the plane of the orbits of the moon and all other planets is not parallel to the plane of the ecliptic. It has a width of approximately 18?.