In August Bob Prechter pointed out in his Elliott Wave Theorist that 6437 days elapsed from the Aug 9, 1982 low to the March 24, 2000 peak in the SPX. (That time period would be consistent with an approx. 17.6 (nominal 18) year progression between numerous peaks and troughs which is discernible in the long term Dow he was discussing) Bob further noted that 6437 days would elapse between the March 24, 2000 peak in the SPX to Nov 7, 2017. So far Nov 7 is the peak in the SPX.
If Nov 7 turns out to be the SPX peak, that would be remarkable time symmetry.