FACTOID # 57: In 2002, every 1000 Swedes made a bus.
 
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Encyclopedia > Planetary motion
Planetary orbit
In physics, an orbit is the path that an object makes, around another object, whilst under the influence of a source of centripetal force, such as gravity. ...

  Results from FactBites:
 
Models of Planetary Motion -- McConnell (1465 words)
This motion is uniform in every way--the speed of the yellow object along the circle is uniform, the circle shares a center with the earth, the object sweeps out equal angles in equal times.
The motion of the green object is perfectly uniform, though it will appear nonuniform to an observer on earth because the earth does not coincide with the center of the motion.
For Copernicus, the apparent retrograde motion of the planets is a result of the relative speeds of the earth and the planets as observed from the earth:
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