With unit system set to meters under Options/General,
for a 2 meter sphere, applying Michaels script results in the sphere occupying most of the 3d view, a good result for people sized objects.

What is the significance of 12 in the atan2 calculation? (What is 12, and why 12?)
(Using a tape measure, my 2 meter sphere measures 10.5 inches on my screen.)

- Brian

https://en.wikipedia.org/wiki/Angle_of_view