When astronomers gaze out to the heavens these days, they see planets, stars and other celestial bodies. They understand how they move in relation to one another and the space they are in. This is due to the works of Albert Einstein nearly a century ago. Before then they were limited to understanding the universe based on the predictions, observations and calculations of mainly Isaac Newton. They were the backbone of classical physics, defining the
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showed last 75 words of 1548 total
inertial and non-inertial frame of reference.
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Guggenheimer, Samuel H. The Einstein Theory Explained and Analyzed. New York: The Macmillan Company, 1925.
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