Astrology > Precession
Aries Pisces? Or what about the precession of the equinox?
The signs of the tropical zodiac, which starts at the Vernal
Equinox with 0° Aries, are not the same as the fixed star
constellations which carry the same names.
The signs are sections of the ecliptic circle, 30 degrees
each. They serve as an abbreviated measurement system for
ecliptic longitude relative to the true equinox of date.
Instead of saying 'Saturn is at 123 degrees' we say 'Saturn
is at 3 degrees of the 5th zodiac section'. Because the
5th zodiac section is named 'Leo', we say Saturn is at 3
Leo. We mean ecliptic longitude relative to the Equinox,
so this is NOT the fixed star constellation Leo.
The fixed star constellations are irregular patches of stars
on the sky. 2000 years ago those areas coincided roughly
with the zodiac sections, and that is where they got their
names from. The fixed star constellations are not used for
measuring coordinates of objects on the sky.
Due to the effect of lunisolar precession, the ecliptic
circle has since shifted versus the fixed star background,
and continues to shift by 1° every 72 years.
Astronomers, who often hate astrology, love to confuse people
by pretending of not being aware of the difference between
fixed star constellations and the reference frame of the
tropical ecliptic coordinate system. In fact, astronomy
uses the very same ecliptic coordinate system as astrology
does. Also astronomers give the position of objects in the
ecliptic by measuring the longitude from the Equinox. Some
astronomers try to make astrologers look stupid, when in
fact all they manage is confusion of the "innocent public".
For further information, please read Precession
and Zodiac or the full documentation of Swiss
astrologers use the sidereal zodiac as well?
In Indian (Hindu / Vedic) astrology, the sidereal zodiac
is used. The precession of the equinox is not taken into
account there. Western astrology only refers to the sidereal
zodiac in connection with the world ages, like the Age of
Aquarius or the Age of Pisces.