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SIGN, as in ("What's your Sign?") is a word the average reader of horoscope columns in newspapers associates with a group name he is labeled by, simply because he was born in a certain one-month time period. This is NOT strictly true. SIGN is actually a term used by astrologers which refers to a sector of the sky (like the segments of a peeled orange). Each of the 12 Signs is a 30-degree arc in a 360-degree circle around the Earth (360/12=30). It is the section of Space in which we can observe the Sun (by day) and the Moon and the other planets which are visible by the naked eye. From our point of observation, all the Planets appear to move within a narrow 7.5 degree band in the sky called the Zodiac (which comes from a Greek expression meaning circle of animals). (Nine of the twelve Signs have animals as their symbol).
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In ancient times (over 5000 years ago in Babylon and Sumeria, where Iraq and Kuwait are now), early astrologers named the Signs after by the major constellation or star-pattern which appeared to form in the sign's sector of the sky; but because the Earth slowly rotates on its axis like a spinning toy top (or precesses), the Signs and the original constellations are no longer in line. The constellations appear to drift westward in the sky, and each Sign appears to shift backwards from its original constellation into the one before it.
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The majority of western astrologers, who use the Tropical system, are not concerned with those constellations arbitrarily named by ancient men; but only with the 30-degree sectors of the sky defined as starting at the point on the horizon at sunrise on the day of the annual Vernal Equinox, which is the first day of Spring (around March 20th on the modern calendar, plus or minus one day). The Tropical astrologers are only concerned with the Signs as parts of the sky where the Planets are positioned relative to us on Earth; not with imaginary star-patterns called constellations that served as familiar place-markers for the early astrologers who did not have the use of telescopes or computers. Both the Tropical astrologers as well as their Siderealist and Vedic (Jyotishi or Hindu) colleagues have chosen to stick with the original names associated with both the constellation and the Sign; but the two groups are actually referring to two different things which no longer coincide as they did 5000 years ago when the Signs were named after the corresponding constellations.
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A minority of astrologers holding to the traditional Sidereal System (sideral refers to "stars") based on the ancient star-patterns still define the Signs by the same constellations they were originally named after. So, depending on which system you use, the Sign called Aries still appears to include the constellation called Aries (in the Sideral system), or (in the Tropical system) the Sign called Aries now covers most of the star-pattern called Pisces by astronomers and sidereal astrologers.
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Astronomers and other scientists, who would naturally be concerned with the star-patterns as reference points, but not as astrological Signs, sometimes point to the present-day difference in constellations and Signs as a reason astrology cannot be taken seriously. Yet those who attempt to discredit astrology on these grounds appear not to understand that the Sidereal astrologers still DO use the original star-patterns as Signs. The Tropical astrologers KNOW about the shift in the Signs, but are more concerned with the position of Planets in relation to earthlings on Earth, and not with the background of far-distant stars. Remember, the stars are real; but the patterns they form are imaginary. Can you actually see a crab in the constellation of Cancer? Tropical astrologers are not overly concerned with ancient star patterns, only with the use of present-day Signs as reference points for the present-day positions of the Planets.
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If we believe the position of the Planets somehow affects, or at least indicates, the psychological make-up or life situations of humans on Earth, then it makes sense to use a system which measures the position of Planets in relation to Earth, not to far-distant stars. Since it is the Earth itself which is slowing changing the tilt of its axis, and aligning itself differently with respect to the stars, it makes sense for us earthlings to re-align our astrological system with respect to the Sun and stars -- and not stay stuck in Time by insisting on the alignments of 5000 years ago. Men and women have evolved over those 5000 years -- wouldn't their astrological system and their personal horoscopes have evolved along with them? This is a judgment call you'll have to make for yourself, and when you do, you'll be joining one of the two major camps of astrologers: the Tropicalists or the Siderealists.
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As the Earth itself precesses (changes the direction it tilts) so that its North Pole points to a different Pole Star), the Tropical system automatically takes this into account by continually adjusting the Sign boundaries as the Earth, and we earthlings inhabiting it, change positions gradually over time. The shift is slow and slight, taking about 26,000 years (a Great Year) to process one full circle of 360 degrees. It takes an average of 2100 years (an Age) to shift 30 degrees through one whole Sign. The concept of the Age of Aquarius refers to the Vernal Equinox precessing backwards into the constellation of Aquarius (it's passed through most of Pisces now, and is due to touch Aquarius in about a hundred years).