achronic vs extratemporal

achronic

adj
  • Happening at sunset (of the rise or fall of a star; opposed to cosmic). 

  • Timeless. 

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. 

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