Both the earth and the moon are subject to gravitational force of the sun. As observed from the sun, the orbit of the moon:
1. | will be elliptical |
2. | will not be strictly elliptical because the total gravitational force on it is not central |
3. | is not elliptical but will necessarily be a closed curve |
4. | deviates considerably from being elliptical due to the influence of planets other than the earth |
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