Re: Is Earth's Rotation Slow-Down a HOAX?
- From: nospam@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
- Date: Fri, 06 May 2005 22:44:25 GMT
Just to top-post on this, the earth has a rotation speed that is slowing down
with time at an extremely gradual rate that won't be significant in a single
year, but shows up in geological time scales.
This is caused by tidal drag - the forces (from gravity of the moon and sun)
that cause the ocean tides necessarily are powered by the rotation of the earth
and thus slow it down. If the earth wasn't turning relative to the moon (or
sun) there would be no tidal energies.
AFAIK it is currently about 0.005 seconds a year, per year. The year is the
same length of time, near enough, but there are slightly more days in a year,
of the order of one second per 200 years, or that instead of 365.25 days a year
we will have 366 days a year in about 13 million years.
Whether this affects timing of astronomical events or not depends on what
you're observing and how you're measuring it. 3,000 years is short time scales
for this type of thing - I'd suspect the interpretation of texts from 3,000
years ago is more likely to be wrong than the earth's rotation be significantly
different during that period.
Apparently on date Thu, 05 May 2005 23:26:00 GMT, "larswilson"
<wilsonl035@xxxxxxxxxxxxx> said:
>Is the theory of Earth's rotational slow-down a hoax? or a misconception?
>
>That issue comes up when recently discovered during analysis of ancient
>astronomical texts from the Seleucid Era determined that earlier texts used
>a different lunar position than later ones, suggesting the lunar position
>was altered to assist with camouflage of revisionism. But that's not where
>the question comes from. It is known that the current "delta-T" and other
>adjustments are made based upon those numerous Seleucid Period texts. If
>those texts had fabricated lunar times then those adjustments come into
>question.
>
>But that is of note, an empirical look at two parameters beyond the Seleucid
>Period texts suggests there has been no change in the Earths' rotational
>speed in over 3000 years. That's the result of a comparison of the current
>decrease in the Earth's rotational speed now and the length of the year
>during the time of Ramses in the 13th Century BC. Currently the Earth's
>Rotational speed doesn't vary even a fraction of second! So it is quite
>stable. The number of days of the year during the 13th Century BC,
>likewise, was exactly the same number of days in the year as now, even to
>the fraction of the day. Thus it would seem by comparison with much
>earlier texts there has been no change in the Earth's Rotation Speed in over
>3000 years.
>
>The difference in lunar time manulation of two compared texts from the
>Seleucid Period was about 13.5 hours speedup.
>
>L. Wilson
>
.
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