Commentary on the description of Wallis
On Apr 3, 12:23*pm, oriel36 wrote:
It may not be possible to work for people engaged presently in science
but it may be possible to work with people on this matter as I am sure
people have some fear approaching matters such as the Equation of Time
as these men approached it and they readily admit that they were
unclear as to what causes the natural noon cycles to vary from one
cycle to the next and where the Equation of Time fits in in terms of
planetary dynamics.
While I could not follow your link to the specific text you sought to
indicate - apparently the document preview is unavailable outside the
U.S. - I did some subsequent searching on the matter.
Wallis was himself responsible for having both the lunar theory of
Horrox (based on the ellipses of Kepler, and not using Newton's
gravity as far as I know) _and_ an essay by Flamsteed on the causes of
the Equation of Time.
So apparently he did consider the work of Flamsteed to have merit...
The system requires only the ability to acknowledge that the orbital
daylight/darkness cycle has a separate cause to the day/night cycle of
daily rotation hence the combination of both motions are observed in
the natural noon inequalities.
We *do* acknowledge this - which is why we say that the presence of
the orbital daylight/darkness cycle means that either one more, or one
less, rotations may take place during a year than the number of net
daylight/darkness cycles we experience, because both orbital motion
and rotation are present as causes of the daylight/darkness cycle.
(And it happens to be one more rotation, because the rotation of the
Earth and its orbit around the Sun are both counterclockwise.)
John Savard
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