Earth axis tilt
http://www.freerepublic.com/focus/f-chat/3877075/posts
Thank you very much for your reply which seemed quite reasonable and explanatory. But it invites another question, what triggered the shift in the earth axis and why do we see an apparent replication of events very similar in nature what took place 3600 years ago. In other words is there an EXTERNAL trigger which returns give or take every 3600 years and interacts with planet earth and indications are that once again we are running into it. Besides I have gathered from some of the articles I have come across that other planets in our solar system also have shown reactions in one form or another to some external influence. So whatever this external influence maybe, which is open to speculation appears to be on a 3600 year cycle.