I know it's been a few years but I'm having a similar problem and I was wondering it those examples could be uploaded again because the links don't work anymore. Especially the one with multiple touch inputs.
easier would be to just make a new how do i post and explain what you are trying to achieve linking this post in. you might actually want to do something different. but a simple solution would be to use
X position to someXPosition+cos(angle*speed)*radius
Y position to someYPosition+sin(angle*speed)*radius
where angle can be the angle from center of the circle to touch X and Y for sin.
speed is any number you want like steps to move can be .15 or 10 the higher the number the faster will move.
radius will be the limit at which the circle area is bound to.
the old planetary system tutorial i was saying 4 years ago got probably removed but here is a similar update on it