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1) Distances. As anyone who has taken introductory physics should know, the force of gravity goes with the inverse square of the distance... ie., the further a body is from you, the less it will affect you. Remember how far away Earth is from the Sun, Moon, and planets (hint: MILLIONS of miles). Though the person who delivered you at birth may be much less massive than any celestial body, they are much closer and would certainly affect you more than the positions of the planets.
2) Other influences. For argument’s sake, let’s say that there is some unknown force that far-away celestial bodies do exert. The laws of physics have yet to be completely understood, so I’ll concede that it may be possible that there is something that works independently of distance and might influence the lives of people. But if that force is not distance dependent, why aren’t stars, galaxies, quasars, or black holes included in astrological forecasts?
3) Uranus, Neptune and Pluto. The three outermost planets were only discovered within the past three centuries. How does that work with the claim that astrologers make about the accuracy of their art for previous times?
4) Precession of the Earth. Due to the slight wobbling of the Earth’s axis, the current position of objects in the zodiac circle are no longer consistent with the tenets of astrology set up thousands of years ago. Your "sun sign" is actually currently shifted over by one (i.e., a Leo is really a Cancer).
5) Build me a house of ham. If you’ve thought about the human reproductive process, you know that a baby spends about 9 months gestating in the mother’s womb before it is born. Why, then, does your birth time matter? Shouldn’t it really be the time of conception that would affect who the baby is to become? Or is it that the muscular lining of the mother protects the fetus from all external forces? In that case, shouldn’t a ham enclosure do the trick?
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Comprehensive study of 'time twins' debunks astrology
By Robert Matthews
LONDON DAILY TELEGRAPH
LONDON- Scientists have once and for all debunked astrology's central claim that our human characteristics are molded by the influence of the sun, moon and planets at the time of our birth in the most thorough scientific study ever conducted on the subject.
For several decades, researchers tracked more than 2,000 people most of them born within minutes of each other. According to astrology, the subjects should have had very similar traits.
The babies were originally recruited as part of a medical study begun in London in 1958 into how the circumstances of birth can affect future health. More than 2,000 babies born in early March that year were registered, and their development was monitored at regular intervals.
Researchers looked at more than 100 different characteristics, including occupation, anxiety levels, marital status, aggressiveness, sociability, IQ levels and ability in art, sports, mathematics and reading all of which astrologers claim can be gauged from birth charts.
The scientists failed to find any evidence of similarities between the "time twins," however. They reported in the current issue of the Journal of Consciousness Studies: "The test conditions could hardly have been more conducive to success ... but the results are uniformly negative."
Analysis of the research was carried out by Geoffrey Dean, a scientist and former astrologer based in Perth, Australia, and Ivan Kelly, a psychologist at the University of Saskatchewan, Canada. Mr. Dean said the results undermined the claims of astrologers, who typically work with birth data far less precise than that used in the study. "They sometimes argue that times of birth just a minute apart can make all the difference by altering what they call the 'house cusps,' " he said. "But in their work, they are happy to take whatever time they can get from a client."