Countach posted at 5:06 AM Tue, 2 November 2021 - #4429763

This is the node set up I used.  I used the Tile 012 texture from AmbeintCG.com for the floor.

It seems to me that 360° of rotation of the Z value equals 2π (6.283185), thus 180° of equals π (3.14159) and so 90° of rotation equals ½π (1.570796). If so, then all other measures of rotation would therefore be in accordance. Any one feel free to let me know if I have this wrong.

For the friends of the 360 degree angle: With the Cycles Math Node you can use normal degree angles instead of radians.
The whole thing would look like this: