On 2013-05-20, oriel36 <
kellehe...@gmail.com> wrote:
> On May 19, 6:24 pm, Tom Roberts <
tjroberts...@sbcglobal.net> wrote:
>> You are abusing the vocabulary when you claim the moon does not spin (or
>> rotate). You are also acting very arrogantly and stupidly. Indeed, contrary
>> to your claim above, if you insist that "the moon does not rotate" to any
>> physicist
>> or astronomer, you will be treated with complete disdain. Because unlike you,
>> they know what the word means.
>
> Astronomers indeed !,what I wouldn't give to encounter another
> astronomer with a clear sense of the difference between revolution/
> orbital motion and rotation/spin insofar as the Earth both spins and
> orbits while the moon simply orbits the Earth,
Well, a), you can't have MORE tea until you've first HAD some, so I don't
know why you're talking about 'another astronomer' there, since you're not
one. at all., and b) no actual astronomer will have the same "clear sense"
you have, because your "clear sense" is flat-out wrong. The Moon orbits the
Earth _and_ spins. Both approximately once an Earth month. The Moon's
equatorial velocity, therefore, is, let's see - 2 pi times 1,738.14 km divided
by 29.53 days (sidereal) - 369.83 km/day, or 15.41 km/hr. Not particularly
slow; nowhere near slow enough to be "unmeasurable". Nowhere near Earth's
equatorial speed, of course.
This velocity is enough to keep the Moon turning as it orbits so the same face
keeps pointing towards Earth, approximately. (See Wayne's point, oft-repeated
and never acknowledged by you at all, about libration.) If the Moon had no
equatorial velocity, then it would not TURN as it orbited, and would keep the
same face always pointed towards any given STAR... and from Earth we'd see its
sides in succession, backwards, over the course of a month, as it went around
the Earth with the same face pointed towards the same direction relative to
the stars.
"Turning so the same face keeps pointing towards what it orbits" is TURNING.
Not ORBITING. It is SPIN; it is ROTATION. You still refuse to do the simple
experiments with nickels, pennies, and/or dimes that would SHOW you this
unmistakably, and still think somehow that "turning to keep your arm pointed
towards what you're walking around" somehow 'doesn't count' as turning. It
does, and that's where the rotation you're trying desperately to deny comes in.
> contrary to the minor blip on the astronomical landscape via Newton
> and his followers who imagined a spinning moon.
As every astronomer in the world, or above it, and every physicist too, uses
Newton's laws of motion as basic elements of their crafts, I'm at a loss to
how you can imagine Newton's influence to be some sort of "minor blip". Even
WITHOUT taking calculus into account. This must be like that New Yorker cover
where the entire rest of the USA was a thin strip on the other side of the
river; narcissism on a grand scale.
> An orbiting object moves through space where all parts of its motion
> move at the same speed whether it crust or core.
That's what we've been trying to TELL you. Orbiting is a TRANSLATIONAL motion.
It does not induce any sort of twisting with respect to inertial reference
frames, the background of the fixed stars.
> The parts of a spinning/rotating object move at different speeds so
> that crust moves at a faster speed than the core and the maximum
> equatorial circumferences moves quicker than latitudes closer to the
> North/South poles.
Correct. AND THE MOON DOES THIS. You can deny it all you want, but it doesn't
change that it DOES rotate, at an easily-measurable speed, and one which is
easy to calculate, see above. Let me know if you need it in miles per hour
to actually understand it, I know you might have some issues with trying to
comprehend a measurement system instituted by Napoleon.
> In short,you have somebody who,for the first time in over 250 years,
> can actually read what Sir Isaac was trying to do
...He'd laugh in your face, and would dismiss you as just another crank. Which,
to be fair, you are, but we have hope you can be reformed and can actually
learn where your error is. He wouldn't let you have access to the Mint either.
> and turns the wider population off
> astronomy and its links to terrestrial sciences.
Oh, I assure you the 'wider population' thinks you're an insane crank as well,
the few that have actually heard of you. (I hope that's not part of the anger
driving this, that everyone knows who Newton is, and only the very few people
who still use Usenet and frequent these groups, plus your parents, have any
idea who you are?)
Dave