extratemporal vs proleptic

extratemporal

adj
  • That appears to happen outside of time. 

  • Of or pertaining to the side of the head behind the eyes; external to the temporal bone of the skull. 

proleptic

adj
  • Of an event, assigned a date that is too early. 

  • Anticipating and answering objections before they have been raised; procataleptic. 

  • Of a calendar, extrapolated to dates prior to its first adoption; of those used to adjust to or from the Julian calendar or Gregorian calendar. 

How often have the words extratemporal and proleptic occurred in a corpus of books? (source: Google Ngram Viewer )