Sorry Ken, but you got your maths wrong here.
The spheres are scaled and translated correctly to give the expected result.
Actually, they *do* give the correct and expected result!

I agree with GrimDude: It is a problem of perspective.

The camera is so close to the outer sphere, that the near part is
perspectively magnified so much, that it appears larger than the X/Y-plane
"equator" which lies farther back (and where the sphere really *do* meet at
the edges as expected.

I attached a screenshot from Moray where I recreated the scene and then
marked the actual equator with red and the *percieved* outer edge with
yellow (front, side, top and perspective view).

So long,
Johannes.

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