code: def latrec(radius, longitude, latitude):
      
      radius = ctypes.c_double(radius)
      longitude = ctypes.c_double(longitude)
      latitude = ctypes.c_double(latitude)
      rectan = stypes.emptyDoubleVector(3)
      libspice.latrec_c(radius, longitude, latitude, rectan)
      return stypes.cVectorToPython(rectan)
docs: Convert from latitudinal coordinates to rectangular coordinates.
  
      http://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/latrec_c.html
  
      :param radius: Distance of a point from the origin.
      :type radius: float
      :param longitude: Longitude of point in radians.
      :type longitude: float
      :param latitude: Latitude of point in radians.
      :type latitude: float
      :return: Rectangular coordinates of the point.
      :rtype: 3-Element Array of floats