Help get location point in bottom left of curve

I want get location and put point in bottom left on closed curve. How can do that?
Present i have get control point of closed curve (rs.CurvePoints(object_id) and compare them. When point on curve and condition true (point in bottom left of curve) then get location, put point.

Help me, Please!

That seems to be a reasonable procedure in this case, what is the problem?

I do not know what you consider to be the “bottom left” of a circle for example…