“Why do rankings of certain keywords fluctuate a lot? For example, a particular keyword ranks 8 in the morning, 10 in the afternoon, 15 in the evening, 9 late at night. The keyword is searched from one location and one IP address only.”
I’ve been soothing client’s fears when they type in a query and see that their site has fallen for 21 years now.
There are many reasons why a site’s ranking will fluctuate – and in reality, in most cases, you won’t definitively know why the ranking changed.