code: def _get_vector_from_satellite_to_sun(
      declination_from_sat_to_sun, right_ascension_from_sat_to_sun
  ):
      declination = declination_from_sat_to_sun
      right_ascension = right_ascension_from_sat_to_sun
      cos_declination = np.cos(declination)
      return Vector3D(
          x=cos_declination * np.cos(right_ascension),
          y=cos_declination * np.sin(right_ascension),
          z=np.sin(declination),
      )
  
imports: from collections import namedtuple
  import dask.array
  import numba
  import numpy
  from satpy.utils import get_legacy_chunk_size
label_desc: Use image node_id 18 for calling a global function with example usage: _get_vector_from_satellite_to_sun(declination_from_sat_to_sun, right_ascension_from_sat_to_sun) and returns: Vector3D