Tested with Minecraft 1.8.8
Press F3, then throw an Ender-Eye and write down the X and Z coordinates as well as the viewing angle ("Facing").
XYZ: / .................. /
Facing: ......... (towards .................... ) ( / ..................)
Go to another location in a different angle (but not too far away), and repeat the test. Write down the data again.
We do the mathematical calculation for you!
Developed by Daniel Marschall .