Re: Animated image of Solar System
- From: "oriel36" <geraldkelleher@xxxxxxxxx>
- Date: 16 Mar 2006 08:44:13 -0800
To John
http://antwrp.gsfc.nasa.gov/apod/image/0112/JuSa2000_tezel.gif
" [Here Salviati explains Jupiter's motion, then follows with:]
Now what is said here of Jupiter is to be understood of Saturn and
Mars also. In Saturn these retrogressions are somewhat more frequent
than in Jupiter, because its motion is slower than Jupiter's, so that
the Earth overtakes it in a shorter time. In Mars they are rarer, its
motion being faster than that of Jupiter, so that the Earth spends more
time in catching up with it. Next, as to Venus and Mercury, whose
circles are included within that of the Earth, stoppings and retrograde
motions appear in them also, due not to any motion that really exists
in them, but to the annual motion of the Earth. This is acutely
demonstrated by Copernicus . . .
You see, gentlemen, with what ease and simplicity the annual motion --
if made by the Earth -- lends itself to supplying reasons for the
apparent anomalies which are observed in the movements of the five
planets. . . . It removes them all and reduces these movements to
equable and regular motions; and it was Nicholas Copernicus who first
clarified for us the reasons for this marvelous effect." 1632, Dialogue
Concerning the Two Chief World Systems GALILEO
" The Symmetry of the Universe
"32 In this arrangement, therefore, we discover a marvelous symmetry
of the universe, and an established harmonious linkage between the
motion of the spheres and their size, such as can be found in no other
way. For this permits a not inattentive student to perceive why the
forward and backward arcs appear greater in Jupiter than in Saturn and
smaller than in Mars, and on the other hand greater in Venus than in
Mercury. This reversal in direction appears more frequently in Saturn
than in Jupiter, and also more rarely in Mars and Venus than in
Mercury" COPERNICUS
The websites you reference is a third-hand account of heliocentricity
and even then it is quasi-geocentric through retaining the Ra/Dec
system putting it in conflict with the exquisite reasoning which
resolves plotted retrogrades through the orbital motion of the
Earth.That John is astronomy !.
Kepler had something to see for the geometers/mathematicians who render
planetary motion in the way that suits you and your colleagues,insofar
as it is the lowest rung on the astronomical ladder -
"To set down in books the apparent paths of the planets [viasplanetarum
apparentes] and the record of their motions is especiallythe task of
the practical and mechanical part of astronomy; to dis-cover their true
and genuine path [vias vero veras et genuinas] is . . .the task of
contemplative astronomy; while to say by what circleand lines correct
images of those true motions may be depicted onpaper is the concern of
the inferior tribunal of geometers" KEPLER
If Obi-Wan wishes to appreceate the motion of planets in the solar
system he had better stay away from this forum,no offence,but to
appreceate how Copernicus worked it out is not unduly difficult yet
mathematicians have no feeling for how it is done and go about withg a
really dumb view.
.
- References:
- Animated image of Solar System
- From: Obi-Wan
- Re: Animated image of Solar System
- From: johnschiap
- Animated image of Solar System
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