Hello,
The March '82 Sky&Tel article, "The Analemmas of the Planets", is an
interesting piece, I scanned a portion of my copy and posted the image
of the Martian Analemma at the following URL.
ftp://ftp.gcstudio.com/pub/sundial/marseot.jpg
As Robert mentions it has a teardrop shape, this I believe is due to
the fact that the eccentricity component currently dominates over the
figure-eight shape of the planet's obliquity component. If I'm not
mistaken, I believe Earth's Analemma had such a shape (teardrop) some
95,000 years ago.
BTW, the article also illustrates a "human" Analemmatic Dial with an
Analemma implemented for EoT correction, the dial is in Tucson Arizona
at the Flandrau Planetarium.
Best,
Luke
R.H. van Gent wrote:
>
> John Carmichael wrote:
>
> > I usually don't write two different letters to the list on the same day, but
> > could'nt resist the following question in view of today's landing on Mars.
> >
> > What would the martian analemma and Equation of Time look like?
>
> Martian and other non-terrestrial analemmas were discussed in:
>
> David A. Harvey, "The Analemmas of the Planets", Sky &
> Telescope, vol. 63 (1982), 237-239.
>
> The Martian analemma is rather simple compared with the terrestrial case and
> resembles an asymmetrical droplet.
>
> Even more boring are the elliptical analemmas of Mercury, Venus and Jupiter.
>
> 8-shaped analemmas such as the terrestrial case are found on Saturn, Uranus,
> Neptune and Pluto. That of Saturn barely manages to form an 8 and those of
> Uranus and Pluto exhibit large north-south spans of 164 and even 180 degrees.
>
> These calculations were based on the planetary rotation parameters as they
> were
> known at that time and can probably be improved somewhat for the outermost
> planets as better determinations have become available.
>
> Also have a look at:
>
> http://www.analemma.com/
>
> ================================================================
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