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Related Terms:
aquarius
leo
virgo
sun
capricorn
vernal equinox
scorpio
gemini
libra
astrology
taurus
aries
precession
pisces
sagittarius
earth
zodiac sign
cancer
axis
Noun
Definition: A form of astrology that measures the position of the sun relative to the vernal equinox. This does not compensate for the precession of Earth's axis, so that the zodiac signs move around the sky relative to the vernal equinox by about one sign every 2150 years.