[Lex Computer & Tech Group/LCTG] earth rotation

Pearlman, Michael R. (Mike) mpearlman at cfa.harvard.edu
Mon Jan 4 11:57:17 PST 2021


Folks,

A hundred years from now the day will be 2 millesec longer. This rate was
computed using historical solar eclipses. If you know any really old folks,
ask them if they have noticed a change.

Happy New Year,  Mike Pearlman



On Sun, Jan 3, 2021 at 5:40 PM john rudy <jjrudy1 at comcast.net> wrote:

> I sent it out because although the questions might be silly the answers
> are usually fascinating
>
>
>
> John Rudy
>
> 781-861-0402
>
> 781-718-8334 (cell)
>
>  <mailto:John.rudy at alum.mit.edu> John.rudy at alum.mit.edu
>
>
>
> 13 Hawthorne Lane
>
> Bedford, MA  01730-1047
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>
> From: Michael Alexander <mna.ma at yahoo.com>
> Sent: Sunday, January 3, 2021 5:37 PM
> To: john rudy <jjrudy1 at comcast.net>; Lex Computer Group <
> LCTG at lists.toku.us>
> Subject: Re: [Lex Computer & Tech Group/LCTG] earth rotation
>
>
>
> The article is an interesting thought-curiosity.  However, it doesn’t
> address the foundational question:  Why on earth [ :-) ]  should the earth
> start rotating faster??
>
>
>
> The earth’s rotation actually should be slowing down.  Why?  Because of
> friction from tides (on land as well as water).  Tidal friction acts as a
> kind of brake (think of the friction from a bicycle brake slowing a
> rotating bicycle wheel).
>
>
>
> Long-term (very long-term) earth’s rotation will slow so earth keeps the
> same face opposite the moon, just as, today, the moon ‘shows’ one face to
> the earth.
>
>
>
>     – Mike Alexander
>
>
>
>
> On Sunday, January 3, 2021, 3:08 PM, john rudy <jjrudy1 at comcast.net
> <mailto:jjrudy1 at comcast.net> > wrote:
>
> https://www.popsci.com/earth-spin-faster/?utm_source=internal
>
> <https://www.popsci.com/earth-spin-faster/?utm_source=internal <
> https://www.popsci.com/earth-spin-faster/?utm_source=internal&utm_medium=em>
> &utm_medium=em
>
> ail&tp=i-1NGB-Et-SfO-1Du6yj-1c-grOD-1c-1DtdWU-l5XZOopE3C-2HKV3Q>
>
>
> &utm_medium=email&tp=i-1NGB-Et-SfO-1Du6yj-1c-grOD-1c-1DtdWU-l5XZOopE3C-2HKV3
>
> Q
>
>
>
>
>
>
>
> Pretty interesting story on what happens if the earth's rotation speeds up
>
>
>
>
>
>
>
> John Rudy
>
>
>
> 781-861-0402
>
>
>
> 781-718-8334 (cell)
>
>
>
> John.rudy at alum.mit.edu <mailto:John.rudy at alum.mit.edu>  <mailto:
> John.rudy at alum.mit.edu <mailto:John.rudy at alum.mit.edu> >
>
>
>
>
>
>
>
> 13 Hawthorne Lane
>
>
>
> Bedford, MA  01730-1047
>
>
>
>
>
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>
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