Why fit sphere is not precise?

I am trying to fit sphere through points on a sphere.
I already know that points are on the sphere.

The fitting sphere is way off through the points that should give other sphere.

Is there any way to achieve better sphere fit?

Sphere Planes2.gh (9.0 KB)

Sphere Planes2_re.gh (14.7 KB)

This is a draft.
Make many random sub-sets of your main point cloud, sets of 3 point each. (I’ve done this in a bad way)
For each set make circle-3pt.
For each circle extract its axis, a line.
Find all the possible intersections between those lines and make mean point > center of sphere!

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What about using arc ; you need 3 points


Thank you both simple arc 3 pt works for me:)

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