> Hello John and everybody on this list,
> I don't want to extend this discussion endlessly
>, but I am surprised to read that the value of
>EOT depends on longitude. Perhaps I am totally
>wrong, but for me EOT is absolute. It is linked
>to the motion of Earth about the Sun and has
>no
Dear all,
the Error Orontii is common in the gnomonic history. Pardies in his book
"Deux machines propres a faires les quadrans" (1673) do it. I have also find
it in the "Encyclopédie méthodique" of Panckoucke (1783-1832) at the article
"Amusements de gnomonique" for the description of the Cap
Hello John and everybody on this list,
I don't want to extend this discussion endlessly
, but I am surprised to read that the value of
EOT depends on longitude. Perhaps I am totally
wrong, but for me EOT is absolute. It is linked
to the motion of Earth about the Sun and has
nothing
Regardless of who has the best answer (and I seem to be farthest from
the mean) we are talking about *very* small errors, which was what my
last post was about. Here I've converted the errors to seconds of
time, and you can see that they are never more than two seconds for
the sampled times. I d
John,
Here's another for you, though I am unsure of its accuracy! I was playing
just now with the NASS Dialist's Companion and changing the date and time
to find when their calculation of EoT turns to zero.
For the longitude of Greenwich (and, as it happens, 52 Lat and with other
corrections tu
Hello all:
The reason that I inquired as to when the Equation of time equals zero is
because I state in my Sundial owner's Manual that on these four days (Apr
15, Jun 14, Sep 1, and Dec 25) my sundials need no EOT correction. I
realize that this statement is not entirely correct as the date whe
Hello,
Alan Nursall at:
http://sciencenorth.on.ca/AboutSN/polaris/index.html
provides 3 sources for conventional Campbell-Stokes instruments and a
source for an electronic sunshine recorder.
t
--
Tom Semadeni O
[EMAIL PROTECTED] o
aka I (Ned) Ames .
Britthome Bounty ><
Dear all,
In the article "A universal Capuchin Dial", published in the NASS
bulletin "The Compendium", vol. 6, no. 1, march 1999, we ( Mac Oglesby,
Bill Maddux, Warren Thom and Fer de Vries ) used the
"menaeus"-construction to lay out the angles for the sun's declination.
As we noted Oronce Finé
>There's a good example of the Campbell-Stokes instrument in Morpeth King
>Edward VI High School weather station (Northumberland UK) - presented to
>the school so not for sale.
For those near Derbyshire in England, there is (or was two years ago)
a Campbell-Stokes recorder in the grounds of
Malcolm Purves contributed:
>I suggest this because last summer I was cleaning out a 15gal carbouy and
>had placed it on a sheet of 1/2inch plywood outside and had filled it with
>water to rinse, yup, you guessed, I forgot it, the sun came out, burned a
>track right through the plywood and burne
On 13 April 1999 16:46 Chuck O'Connell wrote ... It looks like a glass
sphere held in the center of a small equatorial sundial ... following
the curve of the sphere is a piece of waxpaper against a dark
background. When the sun shines, the waxpaper is scorched. Anybody have
a name and possibly a
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