What
is the Sidereal zodiac?  Is it more accurate than the Tropical
zodiac? Yes! Here's a little history that I compiled of how,
when, and why Astrologers "switched" zodiacs.
The Tropical Zodiac, the best known and most popular form of Astrology in the West today, comes to us from the Greeks, from around the 2nd and 3rd centuries CE. The Greeks utilized a Vernal Point fixed (Tropical means "fixed") at 00 Aries, and later Astrologers embraced their calculations without question. Cyril Fagan and Brigadier R.C. Firebrace, authors of "Primer of Sidereal Astrology," say;
"Hipparchus,
when compiling his star catalog, plotted the positions of the fixed
stars from the equinoctial
and solstitial
points for the year 139 BC, approximately, and Posidonius apparently
improved on this idea by making the 'zodiac' as a whole, commence on
the vernal point fixed in 00oAries.
This then was the birth of the Astrology we call the Tropical Zodiac.
Before Hipparchus' time it had no existence, and it was entirely a
Greek innovation."(p17) 
 
Simply
put, this means that the practice of starting the Zodiac year after
year with the sign of Aries beginning right on March 21st never
existed before the Greeks. And it's no secret that the Astrology
we've been practicing for the past 1,800 years or so came to us from
the Greeks. But, what's less well known is that an exalted star-based
Astrology existed long before the Greeks, in the high civilizations
of Egypt, Sumer, Babylon, and Meso-America.
 
When
Sumerian and Chaldean (Babylonian) astrological seals were discovered
in the 19th and 20th Centuries, a problem arose about the meaning of
the frequent references to "solunar returns." Solar returns
and lunar returns were pre-eminent in the charts of the greatest
Astrologers in history. 19th Century Astrologers tried unsuccessfully
to apply contemporary mathematical theories of solar and lunar "great
cycles" to solar and lunar returns. They couldn't succeed
because in their time nothing was known about the precessional wobble
of the Earth. The Sumerians and Chaldeans knew about precession (as
did the Egyptians and the Mayans) but, by the 3rd Century AD, the
Greeks knew nothing about precession. The knowledge had been lost and
it remained that way until the 20th Century. 
People
today have forgotten how much damage was done in Europe and, later,
throughout the colonial world by the Roman Church, how thorough they
were at killing off all opposition - a MILLION Albigensians, for
example - and that the Inquisition was only the climax of a
centuries-long policy of book-burnings and murders of so-called
"heretics." So what happened to the Pagans, Druids, and
others who knew and practiced star-based (sidereal) Astrology? They
were arrested, their books were burned, and their schools were
closed.  Churches were erected over razed pagan temples.  Knowledge
was lost. History was re-written by the victors. 
Anyway,
back to our story. In the mid-20th century, Cyril Fagan presented the
scientific argument that knowledge of precession was the “missing
link” that the ancients possessed which enabled them to calculate
with precision their solar and lunar returns. This was essential in
their predictive Astrology, such as in determining the end of this
Age (calculated by the Egyptians and the Mayans), for example. Solar
and lunar returns are still very important in Astrology -- they are
the anniversaries when the sun and moon return to the exact degree
and sign in the zodiac that they occupied at the moment of birth --
and they cannot be calculated in the Tropical Zodiac! 
The
best that the Tropical Zodiac can do for a solar or lunar return is
fix an incorrect sign and degree onto the Sun and the Moon, (a sign
and degree that exist only on paper and are not the positions that
would be seen from Earth) and then apply that sign and degree to the
same calendar date, over and over again, year after year. Every year
the error grows. The precessional shift since the Tropical Zodiac was
“fixed” in 221 CE has grown today to a whopping 25o,
and since each sign is 30o,
that's nearly one whole sign! In
Sidereal Astrology the solar or lunar return - or any planetary
return - would be calculated for the return to the same sign and
degree and the calendar date would only be of slight importance.
Now
you might be thinking, "So what?" And that seems to be the
position taken by Tropical Astrologers, too. It's acceptable to them
that the signs in which the planets appear have no relationship to
the constellations those signs are named after. That means, for
example, that in the Tropical Zodiac the Sun will be found on April
21st in the sign of Taurus - a Tropical Zodiac place marker (on
paper) and not an astronomical marker (as seen in the sky from
Earth). The error of using a fixed Zodiac becomes obvious when
precession is factored into the equation. A conscientious Astrologer
should be correctly analyzing the planets according to their
positions in front of the constellations they are seen in, when
viewed from Earth and not on a tradition that denies precession. 
Dane
Rudhyar, a well-respected humanist Astrologer who did not embrace the
Sidereal zodiac, said that the idea of stellar energies flowing
through the signs that the planets are located in have no place in
modern Astrology, that we are living in a "psychological
century."(The Astrological Houses, p31) He proposed a humanist
Astrology and said that we no longer need intermediaries
[Extra-terrestrials] "forcing" changes upon us. (pp31-32)
Here was a world-famous Astrologer talking about what he did not want
from the stars! 
So,
what is this precession anyway and why is it important in Astrology?
Well, as you know, the earth rotates in measurable time increments of
24-hour days and 365-day years. But these are not exact measurements
of the earth's orbit around the Sun. That's why we have leap years.
The Earth is spinning like a top and it has a little wobble that
takes it to a slightly different position year after year in a cycle
that runs for 25,800 years, when the Earth returns to its original
position. This is precession and it is tiny - 4 to 6 seconds of arc
per month - but it becomes really noticeable over the centuries. 
The
Tropical Astrologers, using the Greek Astrology, have fixed the
astrological positions of the planets to a 00oAries
Vernal Point that was only accurate in 221 CE! Today, when precession
is factored in, the Vernal Point is actually at 5o
Pisces. Precession is an
indisputable astronomical fact, and its exclusion from “pop”
Astrology is one of the big reasons that Astronomers hold Astrologers
in contempt. 
The
Larousse Encyclopedia of Astrology says, 
"...many
Astrologers are unaware of any other zodiac [than the Tropical
zodiac]...and may be surprised and disconcerted to learn, for
example, that on the first day of spring, when the Sun enters the
sign of Aries, it is actually in front of the stars in the
constellation of Pisces." (p292) 
They
go on to say, 
"...most
Western Astrologers who are aware of the precessional displacement
still adhere to the Tropical zodiac as a system relevant to life on
the Earth. The signs, after all, derive a good deal of their meaning
from the seasons -- at least in the Northern Hemisphere." (p292)
So,
what is the difference to you, the seeker of the Truth about the
meaning of your life? Well, suppose you were born on May 5th. Why
would you struggle with the belief that you are a Taurus, Fixed Earth
sign, a lover of luxury, sensual, stubborn, conservative, hard
working, and long-enduring, when in actual fact you are an Aries,
Cardinal Fire sign, dynamic innovator, impatient, a great starter
whose negative energy is expressed as anger, not stubbornness, who is
dominating, not sensual, and who doesn't know the meaning of
endurance? 
Or,
to take another example, suppose you were born on September 5th. Why
would you want to believe your Sun is in Virgo, Mutable Earth, the
sign of service, where it is afflicted and leaves you susceptible to
physical health complaints and the paralysis of analysis, when your
Sun is really in Leo, Fixed Fire, the sign of drama and center-stage,
powerful in the sign that it naturally rules, and where it empowers
you to be dramatic, and charismatic? And that's only your Sun sign!
All of your planets are affected this way. 
If
you were to have Tropical and Sidereal Astrology charts cast for the
same time and location, and then hold them up beside one another, you
would see that the House cusps are the same and the planets make the
same aspects to each other. But the planets will be in different
houses or else in a different part of the same House because each
planet's sign would be once-removed backwards or, if the planet was
originally at 25o
or more in its sign in the Tropical chart and, therefore, weak in
that sign's qualities, it would still be in the same sign in the
Sidereal chart, but now it would be right at the beginning of the
sign and strong in that sign's qualities. 
In
a Sidereal chart, the planets, signs, houses, elements, and even the
stars they align with, will speak to your Soul, as will the Great
Beings who came here long ago from the Cosmos to build civilizations
that have never since been equaled -- the Sumerians and Babylonians
spoke openly of them (Anunnaki), as did the Egyptians (Neteru), the
Aztecs (Quetzalcoatl), and the Mayans (Kukulcan) -- all great
civilizations who knew their Astrology! 
Surprisingly,
the Sidereal Zodiac has been marginalized by the mainstream
Astrological community. They have chosen to denigrate it or ignore it
altogether for no better reason, it would seem, than fear of change.
But for any conscientious Astrologer, all the technical work has been
done to make the switch. The mathematical formulas have been
re-worked by Donald Bradley, Cyril Fagan, and others. 
Well,
now that you have some history, you can understand the importance of
using the Sidereal Zodiac.  I have been using the Sidereal Zodiac for
14 years. I would never go back to the Tropical Zodiac because I know
the importance of getting the sign, degree, and house position right.
Nothing is random. Nothing is wasted. There is a reason why we were
born into particular circumstances at a particular time and there is
a purpose to our life. This is information that is meant to be shared
with us.  We can utilize it once we understand it.  
Elizabeth 
    Sources:
"The
 Larousse Encyclopedia of Astrology," by Jean-Louis Brau, Helen
 Weaver, and Allan Edmands, Consulting Editors Robert Hand, Charles
 Harvey, and Charles Jayne; 
 
 
"Solar
 and Lunar Returns," by Donald A. Bradley; 
 
 
"The
 Astrological Houses," by Dane Rudhyar; 
 
 
"Primer
 of Sidereal Astrology," by Cyril Fagan and Brigadier R.C.
 Firebrace