Hi all,
I've been watching this thread with interest, and have been honoured that
the draft Sundial Glossary which I'm editing for the BSS has been quoted a
few times for the definitions. I should say, though, that these definitions
are not yet definitive(!) and I am still working to refine
For sundial design purposes I had a table made by the mainframe computer of
my employer.
This table gives for every day in the year the mean values of the
declination and timeequation measured over the coming century: 2000 - 2099.
The values are for 12:00 GMT(noon).
I used the original formulas
To complement this information I have posted a C language program to
calculate the sun/mean sun
difference in right ascension as a function of the declination. Data from
that program is also given.
Please see
http://www.wengersundial.com/Analemma/analemmaDetails.html
Dan Wenger
For sundial
Hi Everyone,
I too have been watching the discussion on so-called azimuth sundials and
have been concerned about the confusion in terminology. I want to second
remarks made by Gianni Ferrari and John Davis.
I think it is useful to divide sundials into major classes based on what
parameters of
Hello John,
I like to give some comments to your message about terms used for sundials.
It is my opinion that to make a classification for sundials is one of the
most complecated problems in gnomonics.
From your message I only quote :
* horizontal dials with styles at arbitrary angles (and
Hello Steve,
As I think to remember you asked for a procedure to
calculate a "monofilar" sundial.
I will try to give such a procedure for a dial with
a circular scale of datelines.
Solving the problem may be done in a number of ways
of course, howeverthe best is the way one is used to.
Hello Steve,
Reading your PS in one of your messages ( see below ) :
Also a bifilar sundial can have a built in correction for EoT.
It is just the same as a usual polestyle sundial with a nodus where I can
draw EoT curves on the dial's plane.
All you can show on a usual dial can be showed on a
Many thanks Thibaud -
that should prove to be a great help to all!
alexei
At 10:07 02/26/2000 , T. M. Taudin-Chabot wrote:
For sundial design purposes I had a table made
by the mainframe computer of
my employer.
This table gives for every day in the year the mean values of the
declination
