Waters' book inspired further speculation in the mid-1980s, including revision of the date by the McKennas, Argüelles, and John Major Jenkins to one corresponding with the winter solstice in 2012. Interpretations of the date became the subject of further speculation by José Argüelles in The Mayan Factor: Path Beyond Technology (1987), promoted for the 1987 Harmonic Convergence. It received further elaboration in the Novelty theory of Terence McKenna.