code: def test_central_params(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])
  
file_path: cartopy/lib/cartopy/tests/crs/test_gnomonic.py
imports: import numpy
  from numpy.testing import assert_almost_equal
  import pytest
  import cartopy.crs
  from .helpers import check_proj_params
label_desc: Use image node_id 5 for calling a global function with example usage: test_central_params(lat, lon) without return types