Caption: Prograde motion (i.e., same direction) and retrograde motion (i.e., opposite direction) relative to the axial rotation of the primary.

The primary is an Earth-analog planet which has a planet-moon system.

The orange moon orbits in a retrograde motion. The other moons have prograde motions.

Credit/Permission: © User:Silver Spoon, 2012 / Creative Commons CC BY-SA 3.0.
Animation link: Wikimedia Commons.
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File: Orbit file: prograde_retrograde.html.