Hi Barry,
Pointarrays have a frame incorporated in their structure.
Posts by Karsten talk about the frames.
Cannot say that I understand them much.
Anyway, Karsten wrote two scripts, splitPts and PointExt which can
be used to change the frame.
Run the output of mPath-Array to pts input of splitPts.
By trial and error:
Outputs of splitPts connect to PointExt as follows:
x-x
y-y
z-z
Rx---no connection
Ry-AngleZ
Rz-AngleX
also connect Rz-AngleY
Point outputs of PointExt node goes to Center of Circle node.
Circle node Out goes to Output.

- Brian

Maybe try Pilou's rotate on the circle instead?

Is there a node to rotate a frame directly?