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Hi Michael,
Pro is really not making an assumption at all. The sphere you created is contrained at it's dimensional values. When you place the point on the sphere you have created the point'sfirst contraint by default by the sphere's diameter. The two additional drag handles are actually the second and third contraints.
You could add the point first with X. Y and Z coordinates and then create the sphere through the point.
Dean
In Reply to Michael Gamber:
When creating a point on a sphere Pro/E lets you define only two offset references.
This is silly, it does not fully define the position of the point and it is making an assumption that it is not letting me define.
How do you fully define the position of the point on the sphere?
"Latitude and longitude are sufficient to uniquely define every point on
earth. I think you might be better off using a spherical coordinate
system for your references. "
I think the problem is that Pro/E doesn't allow you to specify whether or
not the latitude is north or south of the equator.