Cissp Study Guide 8th Edition Pdf Download
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The pendulum is one of the oldest tools for measuring the time and motion of the heavenly bodies. In the 16th century, Johannes Kepler discovered the elliptical orbit of planets. This knowledge was used to determine the relative sizes and distances between the planets, and to demonstrate that the time interval between the rising and setting of the stars is directly related to their mean distance from the Earth. Kepler calculated that the period of revolution of the Earth around the sun is the time required for the Earth to make one complete revolution. He had to divide the period of revolution and the period of revolution of the planet Mercury
By the 1720s, the pendulum clock had been developed by Joseph Priestley then, in 1750, Frances Rose. Joseph Henry invented a circular magnet compass that was also used to create and maintain a strong magnetic field around the Earth. This type of compass is still in use today.
In 1824, James Prescott Joule demonstrated that moving a magnet through a stationary coil produces useful electrical effects. This was the first energy transfer that established the law of conservation of energy. This event also contributed to the knowledge that the Earth has a magnetic field that is produced by the spinning of its iron core.
In 1831, William Hyde Wollaston discovered that the Moon undergoes a retrograde motion. He inferred from that that the Moon was not a central body in the Solar System, but rather, that it was a planet orbiting the Sun.
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