eternal now vs sempiternity

eternal now

noun
  • The nature of God's existence which is outside of time; the nature of a soul's existence in a supposed timeless afterlife. 

  • The condition in which all reality is experienced in the present, with the past contained only in memory and the future only in anticipation or speculation. 

sempiternity

noun
  • Existence within time but infinitely into the future, as opposed to eternity, understood as existence outside time. 

  • Eternity; a seemingly everlasting period of time. 

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