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Unity Move object freely around sphere in Unity3D

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I have a ship centered at the screen with a radius of 10 from the center of sphere located at (0, 0, 0) ... I am using the standard on-screen Joystick provided in the Standard Assets (Mobile) package of Unity. Can someone help me figure out how to allow the joystick to move the ship around the sphere by a specified radius? I currently have the joystick controlling the angle the ship is rotated at but I can't seem to get it to move the ship in a correct orbit.

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