This is not a a school or college question, it is just for my interest. 1. The problem statement, all variables and given/known data suppose I travel 605 meters North , then travel 673 meters West. I have calculated shortest distance of Sq Root(605^2 + 673^2) = 905 meters What I am now trying to calculate is direction to face as if standing on a clock. e.g. calculate angle e.g 140 Deg, then convert that to 10 o'clock = NW I and applying this to excel that's why I'm after a formula. 2. Relevant equations 360-(ARCTAN(605/673))/30 = 10 o'clock. ARCTAN was used because of TAN = OPP/ADJ 3. The attempt at a solution although this formula worked in this case, I would like to know if fluke or proven in every case. Thank you in advance for any assistance given.