Your presentation was a bit confusing at least to me. The geographic north pole relates to Earth's axis of self rotation(in 24 hours). The latitude(angle) of a place - let's say Giza is defined in relation to this pole. Now obliquity to orbit is something else, it relates to the angle of tilt the Earth has in regards to the plane of rotation around the Sun. Thus this 23.5 degrees tilt can and according to scientist do change slightly in large time periods. Actually this change it periodic. The outcome though of this change is that the latitude of a site does not change since the North Pole does not change. Now if there is a cosmic catastrophe, Earth's obliquity to orbit can change and at the same time the axis of rotation(North-South pole positions) can change. So what I ask is according to your theory what was the change and in what direction of Earth's obliquity and how about the North pole? Depending on the direction and length of the movement of the North pole, we can compute the difference in latitude for each site and for Giza. If the North pole did not move then Giza's latitude did not change no matter what the change in obliquity. Can you please clear things up...