code: def vhat(v1):
      
      v1 = stypes.toDoubleVector(v1)
      vout = stypes.emptyDoubleVector(3)
      libspice.vhat_c(v1, vout)
      return stypes.cVectorToPython(vout)
docs: Find the unit vector along a double precision 3-dimensional vector.
  
      http://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/vhat_c.html
  
      :param v1: Vector to be unitized. 
      :type v1: 3-Element Array of floats
      :return: Unit vector v / abs(v).
      :rtype: 3-Element Array of floats