def _cnvRotType(tccName):
    """Converts a rotation type name from the names used in the TCC keyword RotType
    to the (longer) names used locally. Case-insensitive.

    Raise ValueError if tccName not a valid TCC RotType.
    """
    #print "_cnvRotType(%r)" % (tccName,)
    try:
        return dict(
            obj = 'Object',
            horiz = 'Horizon',
            phys = 'Physical',
            mount = 'Mount',
            none ='None',
        )[tccName.lower()]
    except KeyError:
        raise ValueError()