How to Find a Stronghold with Two Eyes of Ender
Triangulate the End portal from the F3 Facing angle: steps, a worked example and fixes for wrong results
To find a stronghold with two Eyes of Ender, throw one, note your X, Z and the yaw from the F3 Facing line, then walk 300–500 blocks sideways and throw again. Each throw gives you a line, and the stronghold is where the two lines cross. Enter both throws in the AlaCraft Stronghold Finder and it returns the coordinates of that point.