Retrograde motion (astronomy)
Pasachoff, Jay M. Hopkins Observatory, Williams College, Williamstown, Massachusetts.
Last reviewed:August 2020
- Apparent motion
- Motion in a solar system
- Revolution about supermassive black holes
- Related Primary Literature
- Additional Reading
In astronomy, backward motion such as (1) a retrograde loop reversing the normal forward drift (prograde) among the stars of a planet or other solar-system object around the Sun, (2) retrograde rotation for an object whose spin is oriented oppositely to the direction of its revolution around the Sun, or (3) an actual backward orbiting of a moon or planet, in our solar system or in another, with respect to the dominant direction of rotation and orbiting. See also: Planet; Solar system
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