3D coordinates on a sphere to Latitude and Longitude

Question

I\'ve got the following information:

There exists a sphere with origin (0,0,0) and radius R. After doing a ray-sphere intersection I know a point (XYZ) in 3D space t

Answer 1

Edit - having reread you question my answer isn't necessarily applicable, but I'll leave it up for reference.

It depends how accurate you wan to be an dwhat purpose you are going to use the result for. There is no single latitude and logitude system, eg WGS84 (USA GPS) or ETRS89 (European GPS) differ slightly and are diverging as the Atlantic Ocean widens.

http://www.ordnancesurvey.co.uk/oswebsite/gps/information/coordinatesystemsinfo/guidecontents/guide5.html

http://www.ordnancesurvey.co.uk/oswebsite/gps/information/coordinatesystemsinfo/guidecontents/guide6.html

Finally this should address your question directly.

http://www.ordnancesurvey.co.uk/oswebsite/gps/information/coordinatesystemsinfo/guidecontents/guideb.html

or

http://www.ordnancesurvey.co.uk/oswebsite/gps/docs/convertingcoordinates3D.pdf