def gravity(gravitation):
    """ translate gravitation name according to Tk specification"""
    if gravitation == 'N':
        result = 'North'
    if gravitation == 'NW':
        result = 'Northwest'
    if gravitation == 'NE':
        result = 'Northeast'
    if gravitation == 'W':
        result = 'West'
    if gravitation == 'C':
        result = 'Center'
    if gravitation == 'E':
        result = 'East'
    if gravitation == 'SW':
        result = 'Southwest'
    if gravitation == 'S':
        result = 'South'
    if gravitation == 'SE':
        result = 'Southeast'
    return result
