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McCormick's reaper ensured that raising wheat would remain the main economic activity in the Midwest. New machines and new improvements in transportation helped farmers plant more acres of cash crops, crops planted strictly for sale. hope this helped
The Holocaust was a watershed event in human history. In the aftermath of World War II, the world—from individual nations to the United Nations; from religious leaders to professionals in fields as diverse as law, medicine, and science; from presidents and prime ministers to private citizens—confronted its legacy. Many of the issues raised by this cataclysmic event continue to have an impact on our lives and the world in which we live.
Copernican heliocentrism is the name given to the astronomical model developed by Nicolaus Copernicus and published in 1543. This model positioned the Sun at the center of the Universe, motionless, with Earth and the other planets orbiting around it in circular paths, modified by epicycles, and at uniform speeds.
The major features of Copernican theory are: Heavenly motions are uniform, eternal, and circular or compounded of several circles (epicycles). The center of the universe is near the Sun. Around the Sun, in order, are Mercury, Venus, the Earth and Moon, Mars, Jupiter, Saturn, and the fixed stars.
Allows calculation of planetary orbital periods around Sun. Allows geometric calculations of planetary distances from Sun. These show nice regularity: more distant planets have longer periods, move slower. Easier to calculate planetary positions than with Ptolemaic model.
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Indian at the Indus River.
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