Another way to look at it, that might have some predictive value, is to project 161.8% (maybe also 261.8%) of the time between yearly lows:
XJO:
10-Mar-2009 Low -> 21-May-2010 Low = 437 cal days
10-Mar-2009 + 1.618*437 = 15-Feb-11
Easy enough to do in an Excel spreadsheet.
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