[SOLVED] Latitude Longitude -> Polar Form -> Cartesian Coordinates 1. The problem statement, all variables and given/known data I need to convert 46 Degrees North 80 Degrees west into Cartesian coordinates, based on the assumption that the earth is a sphere (althought it's not). 2. Relevant equations http://en.wikipedia.org/wiki/Spherical_coordinate_system 3. The attempt at a solution I've attempted to convert and I got ( -767.18, -4350.91, 4575 ) Not sure if this is correct. I'd like to know the North and West signs factor into the equation when plugging in. Can anyone help, or show me a step by step basis please??