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| The ongoing search for knowledge about the Universe. Typical of the progression in our knowledge is the level of understanding about the solar system. Nicholas Copernicus speculated that the sun was at the centre of the solar system. This could be proved only after detailed naked-eye observations made by Tycho Brahe were correctly interpreted by Johannes Kepler (See Kepler\'s laws). The fundamental principles of gravitational attraction were discovered by Isaac Newton: Newton\'s law of gravitation together with his laws of motion explain Kepler\'s laws. The theory Newton introduced was adequate to enable us to put a man on the moon. Einstein\'s theory of general relativity introduced further refinements. |
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| Other Terms : apparent depth | declination | Tyr
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