Re: Newton's theory of "Universal Gravitation"
- From: "Androcles" <Engineer@xxxxxxxxxxxxxxxxx>
- Date: Wed, 21 Nov 2007 17:41:00 GMT
"malibu" <vegan16@xxxxxxxxxxxxx> wrote in message
news:4d42fa9f-65c6-4420-9e5b-c25b6a0981e1@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
: On Nov 21, 10:41 am, "Androcles" <Engin...@xxxxxxxxxxxxxxxxx> wrote:
: > "kingoleo" <tahir.le...@xxxxxxxxx> wrote in message
: >
: >
news:c60ba85e-9f5a-4609-bd05-0704b981a45d@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
: > Newton's theory of "Universal Gravitation"
: >
: > The Moon orbits around the Earth. Since its size does not appear to
: > change, its distance stays about the same, and hence its orbit must be
: > close to a circle.
: >
: > Not true, see
http://antwrp.gsfc.nasa.gov/apod/image/0709/lunation_ajc.gif
:
: Apparently, the large apparent size of the moon in
: August- the 'Harvest Moon'- is because that is when the
: moon is closest to us, not?
It is closest to us once every month, the Moon's orbit is elliptical
as most orbits are. A truly circular orbit is a rare find.
Newton's contribution to science wasn't the simplistic schoolboy
stuff kingoleo is talking about (although that is a good approximation),
but the verification of Kepler's laws which Kepler found empirically
and Newton deduced mathematically using the calculus he devised
for the purpose.
Kepler measured, Newton calculated (without a computer)
and close agreement was found.
Newton (and Leibniz) didn't just come up with the calculus for
the sake of something to do, they had a purpose for it -- Kepler's
observations. That takes genius, which Newton was, but it also
takes a lot of effort doing the calculations by hand even with
Newton's insight.
Genius is 10% inspiration and 90% perspiration.
.
- References:
- Newton's theory of "Universal Gravitation"
- From: kingoleo
- Re: Newton's theory of "Universal Gravitation"
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- Re: Newton's theory of "Universal Gravitation"
- From: malibu
- Newton's theory of "Universal Gravitation"
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