Spherical Distance
The spherical distance between two points 
and 
on a sphere
is the distance of the shortest path along the surface of the sphere (paths that
cut through the interior of the sphere are not allowed) from 
to 
, which always
lies along a great circle.
For points 
and 
on the unit
sphere, the spherical distance is given by
 |
where 
denotes a dot
product.
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((3+4i)/5)^10
