   Calculating Latitude,longitude of the missile in 3D
  Dear allI am working on 3D missile trajectory simulator. i am facing problem in calculating the next position (Latitude, longitude) of the missile.The scenario isA missile is placed in a launcher at place (Latitude1 , longitude1) with launcher elevation of 45 degree. The direction of the launcher is 120 degree w.r.t true north. The missile is fire with the initial velocity of 500. I am confused in calculating the next position (Latitude2 , Longitude2 & altitude) at any time t. Thanks in advance   
  Could you track the missile's trajectory using 3-d Cartesian coordinates, and then convert back to lat/long as needed? That might be easier than what you're trying to do currently.   