|ANOMALY . An angular value used to describe orbital motion of a celestial body. In this book we refer to three different kinds of anomaly.|
|APHELION (A) . The point on the orbit where a planet is at its greatest distance from the sun.|
|APSIS . Either of two points on an eccentric orbit of a planet, one farthest from the sun and the other nearest. In the figure, A and P are the apsides. The line AP is called the line of apsides.|
|CONJUNCTION . Two heavenly bodies are said to be in conjunction when they have the same longitude.|
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Publication information: Book title: The Discovery of Kepler's Laws:The Interaction of Science, Philosophy, and Religion. Contributors: Job S. J. Kozhamthadam - Author. Publisher: University of Notre Dame Press. Place of publication: Notre Dame, IN. Publication year: 1994. Page number: 297.
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