Page 30 - GALIET PHYSICS BLOSSOMS I+
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begins.
2.f. When Jupiter moves away from Earth about one quarter of a circle in its epicycle from the position shown in 2.e., its eastward prograde motion begins again.
2.g. When Jupiter turns 180 degrees or two quarters of a circle in its epicycle from the position show in 2.f., its eastward prograde motion continues until a new retrograde motion begins, as amply seen in the adjacent Figure 4 below.
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