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## Main Question or Discussion Point

I have two points on a sphere (x1,y1,z1) and (x2,y2,z2).

Now I want to plot a straight line over the surface of the sphere between these point.

The radius and the center of the sphere are also known.

What should be the equation of this line?

Now I want to plot a straight line over the surface of the sphere between these point.

The radius and the center of the sphere are also known.

What should be the equation of this line?