SP-349/396 PIONEER ODYSSEY
Figure 1-9. Because of the relative motions of Earth and Jupiter on their orbits, the Earth sometimes catches up with Jupiter since it moves faster. Then, as seen from Earth, Jupiter appears to move backwards through the sky for several months. A typical loop motion of Jupiter, as shown, covers about one-third of a Zodiacal constellation and was used by the Babylonians to trace 10 degrees in the sky.
 

Figure 1-9. Because of the relative motions of Earth and Jupiter on their orbits, the Earth sometimes catches up with Jupiter since it moves faster. Then, as seen from Earth, Jupiter appears to move backwards through the sky for several months. A typical loop motion of Jupiter, as shown, covers about one-third of a Zodiacal constellation and was used by the Babylonians to trace 10 degrees in the sky.

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