![]() Of course, a circle is also an ellipse-an ellipse with eccentricity 0 and in which the foci coincide in the center-and indeed the orbits of most planets are far more nearly circular than the diagram would suggest. Kepler’s laws imply that the speed of revolution of a planet around the sun is not uniform, but changes throughout the planet’s “year.” It is fastest when the planet is nearest the sun (called the perihelion) and slowest when the planet is farthest away ( aphelion). These laws are illustrated in the following diagram:
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