Western astrology is the system of astrology most popular in Western countries. In Western horoscopic astrology, it is based on an exact moment in time, such as a person's birth, in which various cosmic bodies are said to have an influence. In sun sign astrology, only the location of the Sun is considered. Most western astrologers use the tropical zodiac beginning with the sign of Aries at the Northern hemisphere Vernal Equinox always on or around March 21 of each year. Some Western astrologers use the Sidereal zodiac which uses actual star positions.
A horoscope or chart is based on a moment in time and shows where planets and various other cosmic bodies were positioned in relation to each other at that moment. The most prominent of these features is the position of the sun in relation to the signs of the zodiac. The signs used in Western astrology are based on the tropical zodiac and thus bodies are not in the actual constellation. From these planetary positions astrologers draw conclusions about the moment.
Some astrologers also use the position of various mathematical points such as the Arabic parts.
Newspapers often print astrology columns which purport to provide guidance on what might occur in a day in relation to the sign of the zodiac that included the sun when the person was born. Astrologers refer to this as the "sun sign", but it is often commonly called the "star sign". These predictions are vague or general; so much so that even practising astrologers consider them of little to no value. Experiments have shown that when people are shown a newspaper horoscope for their own sign along with a newspaper horoscope for a different sign, they judge them to be equally accurate on the average. Professional astrologers claim that a more complete, personalized horoscope is more effective, but critics claim that this is not the case (see external link to "The AstroTest" below).
As the Earth spins on its axis, it "wobbles" like a top, causing the vernal equinox to move gradually backwards against the star background, (a phenomenon known as the Precession of the equinoxes) at a rate of about 30 degrees (one Zodiacal sign length) every 2,160 years. Thus the two zodiacs are aligned only once every 26,000 years, with the most recent alignment being about 2,000 years ago when the zodiac was principally established. This phenomenon gives us the conceptual basis for the Age of Aquarius, whose "dawning" coincides with the movement of the vernal equinox across the cusp from Pisces to Aquarius in the star background.
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