Rotation
In vvvv rotations are specified in fractions of full counter-clockwise cycles (turns).
0° = 0 cycles 90° = 0.25 cycles 180° = 0.5 cycles 270° = 0.75 cycles 360° = 1 cycle 720° = 2 cycles ...
Search the NodeBrowser for Cycles, Degrees or Radians to find nodes that convert between the different scales.
For more about angles and cyclic animations check: