Space exploration began with the launch of Sputnik and Astrophysics was born as the application of physics to the phenomena observed by Astronomy, which etymologically means laws of the stars.
There are 2759 entries in this glossary.| Term | Definition |
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| Equant |
A device incorporated by Ptolemy in his geocentric model of the solar system to take account of the observed irregular motion of the planets. He considered that the motion of the planets was uniform, not around the Earth itself, but around a point in space called the equant.
See also: epicycle.
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