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12.16 Center of rotation

Center of rotation, to be used in a system of mobiles with circular movement that tour around this.

Equations:	None.
Data:
Name:	Name of the center of rotation.
v:	The velocity of the center.
ang:	Angle of the velocity vector. Measured from the positive X axis, the positive sense is the opposite of clockwise.
x:	X coordinate of the center.
y:	Y coordinate of the center.