def METHOD_NAME(lat, lon):
    gnom = ccrs.Gnomonic(central_latitude=lat, central_longitude=lon)
    other_args = {f'lat_0={lat}', f'lon_0={lon}',
                  'a=6378137.0'}
    check_proj_params('gnom', gnom, other_args)
    assert_almost_equal(np.array(gnom.x_limits),
                        [-5e7, 5e7])
    assert_almost_equal(np.array(gnom.y_limits),
                        [-5e7, 5e7])