Abstract
The desire to understand the orbits of the planets has a history as long as that of mankind. How and why the planets orbit around the Sun are questions in two categories. One focuses on geometry and the other on physics. Johannes Kepler (1571–1630) answered first the how with his laws of planetary motion in Astronomia nova (1609). Isaac Newton (1643–1727) answered both the how and why with his universal gravitation and laws of motion in Principia Mathematica (1687).
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