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I want to move an object along the surface of a sphere with a given velocity. I essentially want to make a simple tether airplane simulator (control line).

I know that I need to work in spherical coordinates for the position of the object and its velocity.

I have seen an old post that descibes a similar problem but I cannot get it to work and cannot fully get my head around it. https://www.physicsforums.com/showthread.php?t=295684

Any help would be much appreciated.

Thanks

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# Velocity on the surface of a sphere

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