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1. Western,
or
tropical, astrology measures the Sun's
movement along the 360° of the ecliptic (the
Sun's apparent path around the Earth). This great
circle is divided into the 12 zodiacal signs, each
containing 30°. Each year, the vernal equinox
(first day of spring) occurs when the Sun moves into
the sign of Aries. The
sidereal system of astrology,
traditional in India and gaining popularity in the
West, measures planetary movement against the backdrop
of
zodiacal constellations. Due to irregularities
in the Earth's orbit, the constellation Aries is
no longer behind the Sun on the vernal equinox, but
rather somewhere between Pisces and Aquarius. The
precise sidereal placement of planets is open to
debate, because the constellations vary greatly in
size and have no actual precise beginning or end,
unlike tropical measurement along the 360° circle
of the ecliptic.
2. Nicholas
deVore,
Encyclopedia of Astrology, Littlefield, Adams & Co.,
1976, pp. 169, 425.
3. Ibid,
p. 73.
4. Each
zodiacal sign falls into one of three types, which
are called qualities; cardinal is initiating energy,
fixed is stabilizing, and mutable is flexible. The
four mutable signs are: Gemini, Virgo, Sagittarius,
and Pisces.
5. Start your
studies with one of my favorite books—perfect
for beginners. It offers a simple and elegant overview
of Dane Rudhyar's philosophy of astrology. Read
The
Practice of Astrology online.