Most likely because Google uses several different data centers that have different rankings, and they are switching your version of Google between different data centers. It is common for me to see different IP addresses for google.com over a 24 hours period.
Yes, I also experience this things.
I periodically taking place with the same other domain for one particular keyword.
For one time I taking the 1st, and 2nd place. The other domain taking the 3rd place. Then for some period, the other domain taking 1st place , and mine is on 2nd and 3rd place.
Do you know how long does it take for all google datacenters to match with one another?
They never will, and if for a moment they do, they will change again, at least for some key words. IMHO
Yep. The old days when all the data centers agreed at the end of a Google Dance at "update" time have now been replaced -- by daily data refreshes, changing algorithm "dials", personalized search results, geo-targetting and a host of other innovations.
Makes ranking software seem like an antique!
|but it will disappear sometime later today. |
Go to <one of the online data center tools> and have a broader look, I'm seeing our friend the July 27th filter back today for a few of our sites on quite a few dc's. This could be what your experiencing, there’s flux, and then theirs filtering.
[edited by: tedster at 1:43 am (utc) on Aug. 15, 2006]
Flucutations are usually a slight variance rather than a dramatic shift. Simply put, sites that rank #2 at a given point may rank #6 at another, but usually does not toggle between #2 and #30. Again as others mentioned this is due to the various datacenters populating the SERPS. If a site does show dramitic shifts, this is probably more due to filters and one could expect the lower position to normailize as all the datacenters start to adjust to the new filters.
I would rather go for searching and analyzing the result over a few datacenters to get a hang of where i stand. Also, i would notice the datacenter from which my results are fetched generally.