Is a small " perturbing force " due to for example a faint gravitational pull from other celestial bodies.
2.
Nevertheless several analytical closed form expressions for the effect of such additional " perturbing forces " are still very useful.
3.
Perturbing forces caused by the oblateness of the Earth will also change the shape ( called the " eccentricity " ) of the orbit.
4.
Most orbit modeling approaches model the two-body problem and then add models of these perturbing forces and simulate these models over time.
5.
Perturbing forces may include gravitational attraction from other bodies besides the primary, solar wind, drag, magnetic fields, and propulsive forces.
6.
The second term, so Newton reasoned, might represent the average perturbing force of the Sun's gravity of the Earth-Moon system.
7.
General perturbations is applicable only if the perturbing forces are about one order of magnitude smaller, or less, than the gravitational force of the primary body.
8.
Because the perturbing force is different in direction and magnitude on opposite sides of the orbit, it produces a change in the shape of the orbit . ]]
9.
For example, a numerically controlled lathe will accurately position the cutting tool according to a preprogrammed profile and compensate for varying load conditions and perturbing forces to maintain tool position.
10.
When it is subtracted from the force on the Moon ( black arrows ), what is left is the perturbing force ( red arrows ) on the Moon relative to the Earth.
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