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geocentric system
The Ptolemaic system also called the geocentric system or geocentric model, mathematical model of the universe formulated by the Alexandrian astronomer and mathematician Ptolemy about 150 CE and recorded by him in his Almagest and Planetary Hypotheses. Ptolemy made contributions to astronomy, mathematics, geography, musical theory, and optics. He compiled a star catalog and the earliest surviving table of a trigonometric function and established mathematically that an object and its mirror image must make equal angles to a mirror.
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<span>Complex drainage systems to keep structures from flooding this works</span>
The Cold war was a series of Proxy Wars, The Cold war began shortly after the end of World War 2, since Germany was overthrown the only superpowers left were U.S and Soviet Union (Present day Russia) They differences were that Soviet Union was a communist country and the U.S was a Captialist country, they both came very very close to Nuclear War since they both were making Nuclear Bombs, they also had Proxy Wars (Wars that were fought between 2 countries but not on their soil) Korean War, Vietnam, Grenada etc, the Soviet Union fell in 1991.
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Cyrus the Great-defeated the Medes and became the first leader of the Persian Empire-created the Immortals, a force of 10,000 highly skilled warriors to serve him-expanded the Persian Empire by conquering surrounding landsDarius 1-divided the Persian Empire into 20 provinces (these were called satraps)-tolerated religions and customs of conquered peoples-established the capital called Persepolis
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Nations agreed to dimantal naval ships and reduce weapons. The Kellogg-Braind Pact was formed.
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