Re: Starmapping software


OG wrote:
"oriel36" <geraldkelleher@xxxxxxxxx> wrote in message
news:1160737628.593742.273200@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx


That planetary motion is seen directly from Earth is a wonderful
experience that really can only be appreciated by going outside and
looking out on the other planets.

Newton could not even get that right and adopted a view that has
nothing to do with either Ptolemaic or Copernican heliocentricity and
how to reason the observed motions of the planets -

"For to the earth planetary motions appear sometimes direct, sometimes
stationary, nay, and sometimes retrograde. But from the sun they are
always seen direct.." Newton

briefly explain what is wrong with that statement.


The statement by Newton is completely incorrect and can be easily seen
to be incorrect.The only acceptable way to treat retrogrades and their
resolution is like thus -

Against the stellar background the motions of the planets are seen to
move forward,stop,move backwards (retrograde) and then move forward
again.From an orbitally moving Earth planetary motions are seen to move
directly in our and their heliocentric motion around the Sun.Hence the
gorgeous Copernican insight can now be easily understood using
contemporary imaging -

http://antwrp.gsfc.nasa.gov/apod/image/0112/JuSa2000_tezel.gif

Dropping the stellar background is as important for isolating orbital
motion as dropping the stellar background is important for isolating
axial rotation in order to comprehend the correlation between clockls
and axial rotation at 15 degrees per hour.




'Direct' and 'Retrograde' have specific meanings here and it is clear that
he is referring to the appearance from Earth.

Retrogrades have a specific meaning indeed and retrogrades are not seen
from an orbitally moving Earth,retrogrades are plotted motions seen
against the stellar background,The Ptolemaic astronomers concluded that
periodic looping motions occured in the motions of the planets against
a stationary Earth while Copernicus split the Earth's motions into
axial and orbital and concluded that the observed motions are due to a
faster Earth overtaking the slower moving outer planets -

"Copernicus, by attributing a single annual motion to the earth,
entirely rids the planets of these extremely intricate coils [spiris],
leading the individual planets into their respective orbits
[orbitas],quite bare and very nearly circular. In the period of time
shown in the diagram, Mars traverses one and the same orbit as many
times as the 'garlands' [corollas] you see looped towards the centre,
with one extra, making nine times, while at the same time the Earth
repeats its circle sixteen times "

Astronomia Nova 1609

Again,not one individual here ,even though they call themselves
'astronomers' ,has yet to affirm the Copernican insight that planetary
motions are seen directly from Earth,even with the time lapse footage
of Jupiter and Saturn before them.The Newtonian mutation of what
retrogrades are and how they are resolved is complete and utter
nonsense.

.

Relevant Pages

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