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answers:
Paul say: Because astrology isn't science.
If you wish to assert that it is please explain how astrologers use the scientific method to arrive at their conclusion. Asserting that there are magical lines of force that control our destinies is not science, it's bunkum.
If you take all the unscientific bunkum out of astrology and just leave behind the pure science, what you're left with is called astronomy. Johannes Kepler is widely accredited with being the last of the scientific astrologers and the father of modern astronomy.
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Starrysky say: These are facts about astrology:
About 3300 years ago, Babylonian priests were tired of predicting their king's future with sheep guts and bird crap. Messy. So they turned to something cleaner, like positions of sun and planets in the star constellations. The ones used most often were the planets they could see (Venus, Mars, Jupiter, Saturn) along the Zodiac or "circle of animals" where they and the sun moved. Dates where the sun passed gave "houses" with constellation names--Capricorn, Aquarius, Aires, Virgo, Leo, Gemini, Taurus, Cancer, Sagittarius, Scorpio, Libra, all the 12 around the whole year's travel of the sun.
Astrology has preserved those dates of sun and those constellations.
But a funny thing happened in 3300 years. The Earth's axis wobbles in a 26,000 year circle. This caused the sun to be in different constellations on the dates that the astrologers have been using. One constellation to the side, or one month's difference in dates. You pick which way to consider it. Aquarians are actually having birthdays in the house of Aires nowadays, etc. Everybody has the wrong "sun sign" and astrological casting or predictions. Wow, what a reality!