[EMAIL PROTECTED] (Mr. D. Hunt) writes:
In relation to the recent question/replies, regarding detecting/correcting
'errors' in the setting of sundials - is there any feasible way of varying
the layout of an Analemmatic dial, to cope with it being on a GRADIENT ?
My own thinking is that
John Carmichael writes:
We could make this question even more complimented if we consider the speed
of light. When we see the sun's center on the horizon we are seeing light
that left the sun about 8 minutes earlier. The sun really has already set.
(of course this has no practical effect
[EMAIL PROTECTED] (Philip P. Pappas, II) writes:
Thank you for your thoughtful comments. I make the statement that the time
method is the prefered method for setting a sundial if and only if the
sundial is properly designed, constructed and leveled (correcting for the
EOT and longitude of
An analemmic dial would be insensitive to refraction effects, wouldn't
it?
Art Carlson
Concerning the determination of the declination of a vertical wall,
I have found useful the small program (and procedure) described
by Mr. Yvon MASSE at:
http://www.apro.fr/usr/ymasse/orient.htm
Bruno
Dear All,
Much has been made of the difficulties in exactly determining where north
is in order to set up a sundial. However, there are designs where this is
not relevant. If a horizontal dial and analematic dial are correctly
delineated on the same dial plate, this plate needs only to be
It is obviously necessary that lighthouses should regulate their lights
according to the hour. In Scotland, and indeed elsewhere, before the
days of electric communication, timepieces at the lighthouses were
corrected by means of sundials, instrument which were commonly found
there. The
Hi all,
Here in Australia we have a Solar hot water system that has a horizontal
water tank that is attached to the top of the solar panel making the tank
and solar panel all one unit and all being mounted on the roof.
Have a look at the GIF file at:
Hello Jim
Refraction depends on the state of atmosphere and land/sea below it.
Temperature, pressure, humidity, density, clarity, temperature of land/sea
et.c. Generally the only way to know current refraction is to measure it
for given direction and for given altutde. Refraction for average
At 05:44 PM 1/21/99 +0100, you wrote:
An analemmic dial would be insensitive to refraction effects, wouldn't
it?
Art Carlson
In my opinion for dialing purposes yes
Slawek
Slawek Grzechnik
32 57.4'N 117 08.8'W
http://home.san.rr.com/slawek
Roderick Wall wrote:
Here in Australia we have a Solar hot water system that has a horizontal
water tank that is attached to the top of the solar panel making the tank
and solar panel all one unit and all being mounted on the roof.
Friends in New Zealand have a simple portable version.
Fellow Shadow Watchers,
Mac Oglesby has reminded me af an email discussion
we had on this problem some months ago. The upshot being that a dial on
a direct north or direct south slope could be treated as one displaced in
latitude BUT the gnomon must be perpendicular to
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