SPX cycle chart

A 65 minute chart of the SPX with various time cycles
drawn in as vertical bars. Click to enlarge

The data set goes back to 2007 and the cycle periods are visually fitted to the data with an emphasis on the most recent price activity.

Of note is the 55.5 TD cycle (333 - 65 min bars) which had been reliable in the past but became less so after the crash in 2008.