# Orbital motion

I want to know the difference between the 2 types of rotations shown in the picture attached .

planetary orbiting are similar to the second figure in the picture attached , all i wanna know what is the difference between the 2 figures .

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russ_watters
Mentor
Is this homework? What do you think the difference is?

it is not a homework , I am lost between 2 facts . in order to have a tilting while rotating there must be another force that is causing a moment about the center of the sphere , in one case it exist in the other it dosent , if for example a rocket that has a certain thrust pass by a planet it would be affected by the gravitationl force for of the planet , why the rocket would yaw while it starts revolving around the planet , and if it wont yaw than it will come to a point where the thrust force will be opposed to the gravitational force , which is not the case in orbiting object satelite or rocket or whatever , cause while they are orbiting they yaw naturally and their thrust force will become tangential to the trajectory , thats what am not understanding properly , why the rocket or anything that is orbiting would yaw while it is revolving ? the second figure in my added picture u saw that the orbiting obejct did not yaw ...

I want to know the difference between the 2 types of rotations shown in the picture attached .

planetary orbiting are similar to the second figure in the picture attached , all i wanna know what is the difference between the 2 figures .
That isn't yaw, its appears to be precession. The 2nd one is 'spinning' on its axis and its axis is precessing like a top in a gravity field.
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russ_watters
Mentor
I don't know if the dot on the olive looking things are meant to be the axis of rotation, but if not, it just looks like in one drawing the olive looking things are rotating and in the other, they aren't. It looks kinda like the way the moon rotates...

why the rocket or anything that is orbiting would yaw while it is revolving ? the second figure in my added picture u saw that the orbiting obejct did not yaw ...
The body orbiting the more massive body would have had an initial angular momentum. Because gravity between widely separated bodies is a central force.