Re: Enjoying the Panis Quadragesimalis using modern imaging

On Jan 13, 7:36 am, oriel36 <kelleher.ger...@xxxxxxxxx> wrote:
The retrograde loops represent the Earth overtaking Mars using the
same stellar background,again,as seen from an orbitally moving Earth -

Unfortunately a complete misinterpretation of the representation
occured via Newton who thought that placing the Sun at the center
would cause the retrograde loops to disappear hence his awful approach
to and resolution of retrogrades -

This is what I don't understand. If retrogades are caused by the Earth
_overtaking_ Mars, then this means that Earth and Mars are both moving
in the same direction around the Sun. And isn't that just exactly what
Newton was saying?

I can only think that you dislike something in his wording, or his
choice to explicitly use a heliocentric *perspective* to describe
heliocentric *motion*. But I cannot comprehend why this would be
considered valid.

Of course if the planets move around the Sun, these motions are most
simply described in terms of how they look from a framework centered
on the Sun - even if we then also must still show that this accounts
for the same motions, which include real visible retrogades, when seen
from Earth. Which astronomers today do; no one denies that the planets
appear to move in a retrogade direction in Earth's skies, and that it
is because of Earth overtaking the outer planets is exactly what
conventional astronomers currently realize. If you think they say
otherwise, you have misunderstood them.

John Savard
.

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