...the unintended result of several combined factors.
I am sure that this accounts for much of what happens. It is amazing that there are not more user-created feedback loops and interacting Google changes causing unintended results.
But that's not what I'm posting about. Over the past years I have noticed indexing changes occurring on a nine day cycle. I am curious to know if anyone else has noticed this or if it is just a coincidental because of my small sampling.