8 month loop is interesting but it doesn't take elements such as volume of trading or factors such as where the data is from.
one of the big problems for bitcoin figures is that it used to be about mtgox,but now the bitcoin price is really free market so the peaks won't match!
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The peaks should match across exchanges, primarily the large peaks every 8 months,maybe not the
exact dates of the high's across but certainly the relative price fluxing, because of arbitrage...
as to exactly why every 8 months we see exponential price increases/ 8 month highs like clockwork is certainly up for debate though, at least beyond a broad moore's law comparison
Edit: Also, I noticed the patterns on coinBASE originally, the charts are from coinDESK