The smooth is done with a fillet.
Here's how I did it.
Boolean diff a sphere with desired curve.
Then sweep the edge curve with a circle
Then fillet this edge curve
My fillet was very limited. If I wanted a larger fillet I would have to reduce the angle by cutting deeper into the original sphere.
Burr
[EDIT] Sorry Micheal, seems we posted at the same time[EDIT]
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