Sidereal Astrology
Sidereal astrology is the practice by some western and all Indian astrologers of basing their study of the sky on the actual position of the planets in relation to the starry background. Most astrologers in the United States and western Europe adopt the tropical zodiac approach and base their study on a notional view of the heavens which does not match the actual present positions of the stars. The sidereal zodiac is used everywhere else.
The two approaches coincided approximately 2000 years ago but due to the precession of the equinoxes are now almost a whole zodiacal sign out of step.
See also
