<HTML>John
There are a lot of people that would argue against what I say about obliquity change. But reguardless of any arguments against me, the fact remains that since the time of the pyramids, the obliquity of this planet has altered significantly. Along side that is minute but significant changes in the precessional period. A reduced obliquity means a reduced precession. Even if we were to work on the 14.4 meters per year(0.45 arc second per year) rate of change for the last 4,500 year period. The precessional cycle would not have remained at a constant 71.6 years per 1° of precessional movement. The figure would have been longer by a matter of days, weeks or months. Do astronomers take this into consideration when calculating precessional movement and stellar positions for past time periods?</HTML>