Kepler discovered the laws of planetary motion from "summary" of To Explain the World by Steven Weinberg
Johannes Kepler was a German astronomer who made significant contributions to our understanding of the motion of planets. In the early 17th century, Kepler worked as an assistant to the great Danish astronomer Tycho Brahe. After Brahe's death, Kepler inherited his vast collection of astronomical observations, which provided him with the data needed to formulate his groundbreaking theories. One of Kepler's most important discoveries was his three laws of planetary motion. These laws revolutionized our understanding of how planets move around the sun. Kepler's first law, also known as the law of ellipses, states that planets move in elliptical orbits with the sun at one of the foci. This was a departure from the prevailing belief at the time, which held that planets moved in perfect circles. Kepler's second law, the law of equal areas, describes how planets move at varying speeds as they orbit the sun. According to this law, a line segment joining a planet and the sun sweeps out equal areas in equal intervals of time. This implies that planets travel f...
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