How do you calculate the angle between three points on a sphere?

[benk99nenm312]

Hi guys. Quick question that i am having trouble with, how do I calculate the angles between 3 points on a sphere? This is not for homework purposes, i am merely curious.

Thanks in advance.

 

[mgb_phys]

Welcome to the wonderful world of spherical trig http://en.wikipedia.org/wiki/Spherical_trig

 

[benk99nenm312]

Oh thank you hah, that's simpler than I thought, that helped a lot. :)