In Berlin, in the neues museum, there was this interesting object:
This interesting hat, made of gold, is from the late bronze age. It was apparently used to convert a solar calendar into a lunar one.
Unfortunately, I don´t speak enough german to understand all the calculations, and not enough memory to remember the numbers, but I think 22 was one of the many numbers used. The Pleiades were also used in the calculation, which seemed very interesting for astrologers.
But, as we are in the age of internet, I could found this entry on wikipedia http://en.wikipedia.org/wiki/Berlin_Gold_Hat has some information.