In gradient processing, GIMP considers red, blue, green to progress clockwise (that is, increasing hue degrees progress counterclockwise).  This is counter to my perception that the color wheel runs red, green, blue progresses clockwise.

I just searched for "rgb color wheel" (without the quotes) in Google images. The numbers for a clockwise red, green, blue are approximately the same as a clockwise red, blue, green.  Notably the one on the Adobe Web site is clockwise red, green, blue. But then, GIMP is not Photoshop. 

The bottom line is there appears to be no consensus as to which direction red to green to blue goes, so GIMP is not "wrong" but some GIMP users may perceive GIMP as being wrong.

I am requesting that there be a preference added under Color Management in the Preferences dialog.

Color wheel direction:

Choices: 
Clockwise red, blue, green (default, to agree with existing GIMP implementation)
Clockwise red, green, blue

Applications:
1) Allow behavior of HSV CW and HSV CCW gradients to agree with the user's perception of direction.
2) Allow creation of an alternate color picker organized in a circle as a color wheel rather than as the current rectangle.