code: def deltet(epoch, eptype):
      
      epoch = ctypes.c_double(epoch)
      eptype = stypes.stringToCharP(eptype)
      delta = ctypes.c_double()
      libspice.deltet_c(epoch, eptype, ctypes.byref(delta))
      return delta.value
docs: Return the value of Delta ET (ET-UTC) for an input epoch.
  
      http://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/deltet_c.html
  
      :param epoch: Input epoch (seconds past J2000).
      :type epoch: float
      :param eptype: Type of input epoch ("UTC" or "ET").
      :type eptype: str
      :return: Delta ET (ET-UTC) at input epoch.
      :rtype: float