ASTRONOMY is the science which investigates all matter-energy in the universe. It is based upon the scientific method, which states that theories must be grounded upon observational facts and endure repeated testing as new observational data is acquired. ASTROLOGY is the pseudoscience which entertains how the relationships of the sun, moon, planets, and stars influence the attitudes and lives of humans. The predictions purported by astrologers have been shown to have no scientific basis in themselves and were the synthesis of Claudius Ptolemy, a Greek astronomer. About 140 AD Ptolemy wrote a series of four books called the Tetrabiblios which summarized all of the principles of astrology which are still practiced today. Astrology began about 3000 years ago in Babylon with what we today call mundane astrology. Predictions were applied to world or national events. To meet these needs, Babylonian astronomers were required to keep a continuous record of accurate planetary movements which in themselves were good astronomy. They did not seek answers to questions about the physical universe, but attempted to understand the motions of celestial objects in more of a mechanistic manner. By the sixth century BC astrology had spread as far east as India where it still flourishes today. Meanwhile, the Egyptians modified Babylonian concepts by developing a more personal version of astrology which was later synthesized into natal astrology by the Greeks after the conquests of Alexander the Great. The Greeks believed that our lives were preordained by the precise configuration of the sun, moon, and planets in the sky at the moment of our birth. This astrology is still practiced today by Europeans and Americans along with horory astrology which provide the daily horoscopes found in newspapers and tabloids alike.