Hi, all diallists !
Writing from France (this to please you excusing my under-basic
English !:-)), I have the same problem than Alexei Pace :
I'm asked to realise a vertical sundial on a circular tower. I don't
know exactly (it's a truism !) how to proceed.
This sundial will probably be built
Hello, sundiallers !
One crazy question isn't enough !
A second one came me in brain (or the thing I use as ;-))
How can a diallist use a GPS receiver to mesure the declination of a
wall ?
I asked me this question just some minutes before the buing of such an
apparatus ! It's very practical
Daniel Lee Wenger [EMAIL PROTECTED] writes:
The reading of standard time via a sundial may be accomplisted by
mearly reading the declination of the sun and using an analemma,
determining standard time. At no point is the current date needed to
do this.
Way, way back I explained why I was
John Davis [EMAIL PROTECTED] writes:
I have a question/challenge to all you sundial designers: what is the most
accurate design for a Standard Time dial?
...
As a starter, the Singleton dial recently discussed here would seem to be
a reasonable candidate. It's main limitation, common to
Art
At the solstices there is no ambiguity. The analemma intersects the
tropic of cancer and the tropic of capricorn at one point so there is only
one value for the EoT.
At all other times of the year, except for one instant when the two paths
of the analemma cross, there is only the need to
John
My recent postings relate to this question. The leap year is not relavent
in the use of an analemma
for reading standard time. The leap year is an adjustment to keep the
number of rotations of the earth
in synch with the revolution about the sun. The reading of standard time
using an
Hi Steve:
Your interpretation of the various dial classifications seems to be correct,
although I'm certainly not an expert, as you know! Reading your letter,
which was written so clearly, gave me confidence that I had interpreted the
discussion correctly.
Thanks,
John C.
Gianni wrote:
The
Hello John D.
In answer to your challenge, I would pick a Singleton type dial over the
Swensen dial because:
1) A Swensen dial can only give accurate times on the hour. For times
between the hour you need to guesstimate.
2) A Singleton time line is easier to read since the analemma is
Hi all,
I have a question/challenge to all you sundial designers: what is the most
accurate design for a Standard Time dial?
The reason behind the question is to find a way to stop members of the
public looking at a public dial, inspecting their watches, and concluding
that dials never tell
In reply to John Davis:
I have a question/challenge to all you sundial designers: what is the most
accurate design for a Standard Time dial?
My vote is of course for a dial with the EOT built into the hour lines to
give the annalema shapes such as used in the Swensen Sun dial at :
Hello Arthur,
While it is true that at a given solar declination one could mistakenly
read the wrong side of an analemma it is quite simple to add guide
arrows along the analemma to indicate the direction the sun is currently
traveling, e.g., with the sun in the winter months the
At 19:36 1-3-00 +0100, you wrote:
-Original Message/Oorspronkelijk bericht--
How can a diallist use a GPS receiver to mesure the declination of a
wall ?
if it is a very long straight wall you can walk along the wall and find out
the course of this movement. Then deduct or add 90°
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