There is less degrees on the screen (lower degree/pixel), so if you continue to rotate the same degree/count then you will rotate more pixels. You have to reduce the degree/count to rotate the same degree/pixels, and end up with a longer distance to rotate 360 degrees.   Degree/pixels only uses the middle pixels. If you know there is a total of 103 degrees horizontally (Overwatch), which is across 1920 pixels, then you can scale that down to find how many there is in 1 pixel. 2 * at