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Newsgroups: talk.origins
From: Jim Willemin <jim***willemin@hot***mail.com>
Date: Sun, 24 Feb 2008 13:51:26 -0600
Local: Sun, Feb 24 2008 2:51 pm
Subject: A correction, and an apology to Ray and to the group
In a previous thread, I calculated the date at which the star Thuban
would be three and a half degrees from the celesital pole, and arrived at dates of 2581 BCE and 3089 BCE ( MessageID <Xns99575C1BEDB3Fjimwillemingmail...@194.177.96.78>). I made an error in this calculation. I forgot that the pole precesses along a small circle, not a great circle, and that degrees in a small circle do not subtend the same length of arc as degrees on a great circle (the correction required is to multiply by the sine of the angular radius of the small circle, in this case 23.5 degrees; the correction factor is 0.399). That is, when the pole had precessed three and a half degrees along its small-circle path, the actual angular distance between the pole and Thuban was (0.399 x 3.5), or 1.4 degrees. Making this correction in my calculations, I discovered that the pole would need to precess roughly 8.8 (small circle) degrees along its path for Thuban to lie 3.5 (great circle) degrees from the pole. Taking the nearest approach of Thuban to the pole as 2831 BCE, and a period of precession of 25,800 years gives 629 years for the necessary precession to occur, or dates of 3640 BCE and 2202 BCE for alignment of Thuban with the descending passage of Khufu's pyramid. The latter date is only 60 years from Ray's invulnerable date of 2141 BCE for the alignment. Thus, I apologize to Ray, for insisting on an erroneous date (2581), and You must Sign in before you can post messages.
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