Four moons revolve around a planet in circular orbits. Determine the period and radius of each orbit. Use the buttons on the right to start/stop the animation and step it frame-by-frame. Readouts of time and position coordinates are displayed above the buttons.
This animation shows the retrograde motion of two moons of a planet (blue) from the point of view of the middle moon. From the point of view of the planet, the orbits would be circular.Gravitational forces between planets are ignored.