code: def vzero(v):
      
      v = stypes.toDoubleVector(v)
      return bool(libspice.vzero_c(v))
docs: Indicate whether a 3-vector is the zero vector.
  
      http://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/vzero_c.html
  
      :param v: Vector to be tested 
      :type v: 3-Element Array of floats
      :return: true if and only if v is the zero vector
      :rtype: bool