TODO docs.

def degrees(radians=0, arcminutes=0, arcseconds=0):
    """
    TODO docs.
    """
    deg = 0.
    if radians:
        deg = math.degrees(radians)
    if arcminutes:
        deg += arcminutes / arcmin(degrees=1.)
    if arcseconds:
        deg += arcseconds / arcsec(degrees=1.)
    return deg