[MasterChiToes]

The Docs say:
The percent rotation around the X plane.
The percent rotation around the Y plane.
The percent rotation around the Z plane.

However, each plane is 2D. So, this means:
The percent rotation around the XZ plane.
The percent rotation around the XY plane.
The percent rotation around the YZ plane.

(That is based on an X-plane of 50 (%) flipping the planet upside down.)

The unmodified initial orientation of planet has poles on Y axis (north being down) with the 'front' of the planet facing out (of the screen).

Looking into the screen on the motion:
Z CCW (from the top) with axis in-out (normal) of map.
Y (right to left) with axis bottom-top of map.
X (down to up) with axis left-right of map.

Looking at the starting rotations:
-- - North-South along Y (south up) front Z- (facing out)
25 Z North-South along Z (south out) Front Y- (facing down)
25 Y North-South along X (south right) front Z- (facing out)
25 X North-South along Y (south up) front X- (facing left)

******** conclusions *******
The axial motion:
The Z-pole's positive rotation is clockwise (from below the map, Z+).
The X-pole's positive rotation is clockwise (from the right of the map, X+)
The Y pole's positive rotation is clockwise (from the top of the map, Y+)

Initial orientations (Starting Rotate):
X rotates the object X+ toward Z- (right of screen towards you) or clockwise about the Y axis.
Y rotates the object Y+ toward X+ (top of screen towards right of screen) or counterclockwise about the Z axis.
Z rotates the object Y+ toward Z- (top of screen towards you) or counterclockwise about the X axis.