Re: Orbital precession w/o GR
- From: Eric Gisse <jowr.pi.nospam@xxxxxxxxxxxxxxxx>
- Date: Thu, 29 Nov 2007 12:10:42 -0900
On Thu, 29 Nov 2007 16:13:05 -0000, "JMA" <NOSPAM@xxxxxxxxx> wrote:
"bz" <bz+spr@xxxxxxxxxxxxxxxxxxxx> escreveu na mensagem
news:Xns99F6DA3E1FE47WQAHBGMXSZHVspammote@xxxxxxxxxxxxxxxxx
"JMA" <NOSPAM@xxxxxxxxx> wrote in news:5r6adjF1335cpU1@xxxxxxxxxxxxxxxxxx:
What is really a mystery is how people talk about
precession of mercury orbit, but nobody has any idea
what precession is
[quote http://www.thefreedictionary.com/precession]
1. The rotational motion of the axis of a spinning body, such as the
wobbling of a spinning top, caused by torque applied to the body along its
axis of rotation.
2. The motion of this kind made by the Earth's axis, caused mainly by the
gravitational pull of the Sun, Moon, and other planets. The precession of
Earth's axis has a period of nearly 25,800 years, during which time the
reference points on the equatorial coordinate system (the celestial poles
and celestial equator) will gradually shift their positions on the
celestial sphere. The precession of the equinoxes is the slow westward
shift of the autumnal and vernal equinoxes along the ecliptic, resulting
from precession of the Earth's axis. See also nutation.
[unquote]
For instance:
A 3 years old kid knows very well what light is.
But a 3 years old kid knows nothing about what light really is and
how he can be fooled by light.
Some facts about precession:
1 - Constant precession requires constant torque.
No, it does not. Study rigid body motion.
Where is the constant torque? The torque is highly variable.
Strawman, and the argument is motivated from classical mechanics.
2 - Where does the kinetic energy come from?
I believe kinetic energy comes from the kinetic energy fairy.
The kinetic energy comes from the potential energy.
Nope. The sum is conserved and there is an interchange of the two but
that does not mean one comes from the other.
Since energy is conserved, potential energy needs to be
dissipated. That is, a smaller secondary motion, called
nutation, occurs.
If you knew that planets orbit in a plane and understood what nutation
is you would see why what you said was really, really stupid.
.
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