December 19, 2022 11:12AM
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Admin
Registered: 17 years ago
Posts: 3,732
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molder Wrote:
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> They are using decimals.
Nobody in the ancient world used decimals until the Chinese invented them in the 4th century BC. This is provable. [
en.wikipedia.org]
If they'd had the notion of decimals, we would have seen it in their calculations because it speeds up all kinds of mathematical processes as well as in textbooks such as the Rhind Mathematical Papyrus. It would have reduced the cumbersome calculations found in these books to fairly simple operations. It would have been one of the great innovations of a very ancient world.
> Not only that they are
> using trigonometry to speak to you.
Trigonometry is all about angles. Which they didn't measure.
> A guy named Derek Skane pointed out the cosine of
> 756 a common value for the base of the Great
> Pyramid = cos 756 = 0.809016994 x 2 = 1.618033989 phi.
The Rhind papyrus has a problem that asks for the slope of a pyramid. They use sekeds (rise to run.) If they'd had cosines they would have used them in a number of applications (to make accurate maps, for instance.) My cat's ears have a slope as well. This doesn't mean she does trigonometry.
> They are speaking to you Byrd 687 about Mars.
And that's another thing -- how did they know how long it took for a Martian year? The opposition of Jupiter wasn't discovered until around 500 BC - and wasn't discovered by Egyptians - (https://adsabs.harvard.edu/full/2012JRASC.106..108A) because nobody had accurate tables of the sky. (also see this chapter on ancient Egyptian astronomy: [
research.iac.es]) If they couldn't determine an opposition (which has a precise location in the sky) then how would they know whether a year was 687 or 686 or 688 days (or 690 days, for that matter)?
-- Byrd
Moderator, Hall of Ma'at
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