Grey Cloud,
Grey Cloud wrote:Hi Nick,
Re precession and Pole Stars, you wrote:
nick c wrote:Apparently, this is one of those statements that has been repeated so many times it has become "fact."
I'm intrigued, can I ask where you got that from?
History books and other writings on Egypt state that Alpha Draconis (Thuban) was the North Star during the Old Kingdom. Googling "Thuban +ancient Egypt" will bring up a wealth of examples, such as this one:
http://www.springerlink.com/content/kl1014041w6j0kv4/
I was pointing out that this "fact" is the result of modern retrocalculations of today's rate of precession, not the result of an analysis of any ancient document or observation, such as a star map that shows Thuban as the North Star.
Grey Cloud wrote:I'm confused here. A) Are you suggesting that the Egyptians didn't align their monuments with anything or that the Earth's orientation has altered so dramatically that it is impossible to say what they originally aligned with?
Ancient buildings were built to coordinate to one or another of various astronomical alignments, such as cardinal points, equinoxes, etc. I am only pointing out that if you built a structure and aligned it with the pole star, and subsequently the Earth changed its' orientation in space and pointed its' axis in a new direction, your structure would still be aligned with the new pole star (assuming the axis pointed at a visible star). In reality, the coordination of your structure would be with the Earth's axis, not with the star to which that axis points. There is no evidence that Thuban was ever actually observed by anyone in ancient times to be the north star. [If the axis changed within the Earth, ie. the location of the N (and S) pole shifted its' geographical position on the globe, then your structure would no longer be aligned with the pole star. However such a change, might only be temporary as the equatorial bulge would influence the axis to return to at or near its' original position.]
b) Modern astronomers know that the rate of precession varies.
Modern astronomers calculate the rate of precession presently observed, and ASSUME that it has always been so.
c) What evidence do you have that it has been interrupted?
-What few ancient observations and starmaps exist are not reconcilable to today's sky. Numerous Babylonian tablets, including the "Venus Tablets," don't make uniformitarian sense, see:
http://www.thunderbolts.info/forum/phpB ... a&start=30
Among these astronomical tablets is a computation of the longest day of the year (summer solstice), at Babylon, being equal to 14 hours 24 minutes. The modern calculation based on the present order is 14 hours, 10 minutes, 54 seconds. This led modern scholars to determine that the observations were not made in Babylon, even though the observatories were in Babylon, and that's where the tablets were found.
-One of the two star maps on the ceiling of the temple of Senmut (an 18th dyn official) depicts a sky with constellations in a reversed order, as if the entire globe was turned upside down. Much has (and still is) been written about Senmut's star maps, but rarely is it mentioned that one of the maps shows the constellations are in reversed order. Here Clagett quotes Pogo who compared the reversed order Senmut map, with one from the Ramesseum (which depicts the same order as Senmut) and one from Seti I which depicts the correct (present) order:
On the ceiling of Set I, on the other hand, the orientation of the southern panel is astronomically correct
[...]
With the reversed orientation of the southern panel [in the Senmut tradition], Orion, the most conspicuous constellation of the southern sky, appeared to be moving eastward; i.e', in the wrong direction
[...]
http://books.google.com/books?id=xKKPUp ... 22&f=false
Velikovsky theorized that this star map commemorated a tradition remembering the time when the Sun changed direction and E and W were reversed, [see
Worlds In Collision, chap 5 "East and West"] he goes on to cite numerous references to the Earth "turning over" or the Sun reversing it's course after a great catastrophe. Though he specifies that these accounts probably refer to more than one specific catastrophe and serve to, at the very least, show that the supposed regular movement of the celestial sphere (including precession) has been disturbed.
Some of these:
1.Plato,
The Statesman,"I mean the change in the rising and setting of the sun and the other heavenly bodies, how in those times they used to set in the quarter where they now rise, and used to rise where they now set..."
2. "Tevel is the Hebrew name for the world in which the sun rose
in the west. Arabot is the name of the sky where
the rising point was in the west."
3. Herodotus relates how Egyptian Priests told him that the Sun on more than one occaision reversed it's movements, rising in the west and setting in the east.
4. from Bellamy,
Moons, Myrhs and Man, p69 "The Chinese say that it is only since a new order of things has come about that the stars move from east to west."
5. Seler an early researcher of Mesoamerican culture, was perplexed by accounts of reversals of the Sun's motion, "However, one cannot imagine the sun as wandering eastward: the sun and the entire firmament of the fixed stars travel westward."
The discovery of precession is conventionally attributed to [url2=
http://www.gap-system.org/~history/Biog ... rchus.html]Hipparchus[/url2] circa 150 bce, he is also credited with calculating the distance to the moon. What evidence is there that anyone before, knew of precession?
nick c