Minecraft wiki entry for Defeating_the_ender_dragon, associated text: An alternate method for locating strongholds is to use the angles, in which ender eyes move from two different points to mathematically calculate the coordinates of the stronghold. Given the coordinates of two points in the world, (X1, Z1) and (X2, Z2), and the exact angles at which eyes of ender move, A1 and A2 (all of which can be measured from the F3 debug screen), the stronghold is at the following coordinates: