Ah, almost forgot: 12 months of 30 days each are in the old Egyptian year - and those were based on the rotation of the star Sirius, if memory serves (they used it to time the year), and was based on the legends of Osiris and Thoth. (err, my minor was in martial history (ie hopology), as opposed to general history, so I may have just blew it entirely. :) ) /P