At 08:10 AM 11/23/97 -0600, you wrote:
Happy Thanksgiving Season to All,
2. I have been reading a Dover book called Excursions in Geometry by
C. Stanley Ogilvy in an attempt to better understand projective
geometry. Does anyone reccommend. other geometry books that may aid a
dialist? Has
At 03:51 PM 11/9/97 +, you wrote:
Hello everybody!
I'm new to the list.
.et.c.
Angel Barcelo
Hi Angel and welcome to the list.
As Angel is using Mac maybe someone would run the mentioned Zonwvlak program
for his data once he will be able to supply them. We gained a sundialer by
happy
At 06:25 PM 12/5/97 -0800, you wrote:
Many thanks to all those who responded to my enquiry. Much useful
information was received.
As a matter of interest, I was able to compare various astronomical
calculators with interesting results. Consider times of sunrise and sunset
on December 3 in
Hi Fer
Probably you got appraisal from many but still I want to congratulate you
publicly on Zonwvlak. Perhaps the best appraisal was done by Harold
Brandmaier who prepared the HTML manual for your program. After all e-mail
is only e-mail and does not take that much time as the mentioned
At 06:52 PM 12/12/97 +0100, you wrote:
Hi All,
After so many years I discovered an error in my program Zonwvlak.exe.
Of couse there have been more minor errors, such as typing errors, but
this one is a little more serious.
But don't panic, as far as I know no one has noticed this error at all.
grids for any position
of eye would be more complex unless you use computer.
It is amazing that the projection was discovered in ancient times and its
features were fully understood without analysis and calculus.
Slawek
- Slawomir K. Grzechnik
http://home.earthlink.net/~slawek/
32 45.5' N, 117
Hi John
Short answers to some of your questions.
Refraction does not change the azimuth, it significantly changes the altitude.
Time lap between visible and astronomical sunrise (sunset) depends both on
latitude (heavily, see what is going on beyond polar circles) and on
season. If you want to
:
Slawomir K. Grzechnik [EMAIL PROTECTED] wrote:
Hi John
Short answers to some of your questions.
Refraction does not change the azimuth, it significantly changes the
altitude.
[...]
Slawek
Yes, the azimuth will be preserved, but the change in altitude will
change the position
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
publications of USNO and Her Majesties Nautical Almanach Office in
London. Is this because of formal closing of the Royal Greenwhich
Observatory last year? It looks like some epoch has come to an end.
Slawek
At 10:51 PM 1/31/99 +0100, you wrote:
Slawomir K. Grzechnik wrote:
Where did you get
Hello John
Our maiordomo Daniel Roth maintains sundial pages index in the good city of
Koeln and welcomes new submissions of URLs by email to
[EMAIL PROTECTED] The page is
http://www.ph-cip.uni-koeln.de/~roth/slinks.html
Slawek
At 11:44 AM 2/4/99 +1000, John Pickard wrote:
Greeting
one up
used for very little.
Anthony
-Original Message-
From:Slawomir K. Grzechnik [SMTP:[EMAIL PROTECTED]
Sent:Tuesday, February 09, 1999 6:01 AM
To: sundial@rrz.uni-koeln.de
Subject: Re: Magnetic North
Hello Fernando and other Fellow Dialers
In spite
Frank and other Fellow Dialers
Having no clue to the dead reckoninng mystery, I have a suggestion to the
meaning of the dog watch. The exact translation is being used by Polish
sailors. Being the nation of land-lubbers for most of our history, we took
to sea seriously in XIX century only. Most
At 12:41 AM 2/20/99 -0500, you wrote:
Does anyone out there in sundial land have a source that gives the
circumstances of lunar eclipses in 1582? I am trying to help a young man
with a project related to efforts to determine the longitude of Mexico City
in that time period. We need an eclipse
Hello Malcolm, Richard, Gordon, Bill, John, John, Fernando et. al.
I must say that I track with pleasure this off topic subject. Yes, time was
and is very emotional issue.
1. I would not worry about Internet Time, the name is a marketing trick. In
reality time service on the Internet is taken
Hi John, Gordon, Malcolm et. al.
Gordon is basically right saying that if not for friction the rotation
would stop at infinity and the decay of rotation would be exponential. Yet
even small amount of friction dissipates energy and the longer it works the
more its effect is visible and we are
Hi David, Richard et. al.
None of us is picky, we are discussing things.
1. David, you wrote
Flight would work quite well without viscosity. The lift generated by
aircraft wings is due to a pressure difference above and below the wing,
and this is created by the shape of the wing. Whilst
So far as I know the sun compass was in use in North Africa only. The
compass was very specific, it was equipped with the plate engraved with the
so called Weir Diagram which consists of concentric ellipses. The diagram's
main purpose is determination of azimuth with few simple actions. Accuracy
Dear Dialers
After my recent post about GPS and sextant I got few replies to me
personally. This is really amazing how sextant catches human imagination.
No other instrument, whether telescope or theodolite, not to mention GPS,
has such fame like sextant.
Note that it is of not much use for
Michael, Tom, Bill, John, Fernando et al
Look, horsemanship is still with us, same is with sailing under sail,
sundials are still being designed and built, Mike can gut a deer, even
steam engines are maintained and used. So sextant will not perish. Its
reign held well over 200 years. In 90-ties
At 06:55 PM 3/31/99 +0100, you wrote:
Hello Evans
Slawek Grzechnik wrote During WWII convoy navigators, whatever their
civilian backgrounds, became superb sextant users. Well, some of them
did and it was always an astonishment to me that anyone could
successfully command, say, a Liberty ship
Slawek Grzechnik
32 57.4'N 117 08.8'W
http://home.san.rr.com/slawek
Yvon
The site and pages look interesting. Why did not you use today's Lingua
Franca instead of French?
Slawek
At 04:45 PM 4/5/99 +0200, you wrote:
Dear all,
there are some new things on my website (but sorry in french):
- How to draw an horizontal sundial with chiefly a compas
- An old
John
Absolutely. I do understand Australian :-) and am even able to recognize
it, when spoken at least. The issue of languages is really interesting. In
America, where I live now, the language is called English and its
forefather is called British English, sic!, so that people do not get
I think Mike Shaw stated the matter for good using fromerly cited examples
of darts and guns.
Strictly speaking accuracy and precision are sort of independent. If your
mean (average) shot is on the target then you are accurate even if you
never hit the target precisely. Your shots may be off
I did not have much time to study the list recently and coming back from
short vacations I noticed that as usual subjects are fascinating.
Yes, longitude was the biggest problem in navigation and the working
solution to it was the invention of chronometer in late 1700s. Cook used
chronometers
Hello Fernando
The shortest answer would be to have the cylinder with the dial on its
outside and few styles around it so that at least one is working. The
cylinder should be inclined so that is is parallel to the Earth axis. Then
you would have longest expositions. On the poles it would work
Bravo Dan
I just looked at your paper.
What an excellent idea to interpret elements od spherical triangle as
rotations just in order to derive laws of sines and cosines. The ellegant
pdf format is a bit awkward in use, you have to download it, have the
viewer. You should make a regular HTML page
Pete
To some extent you are right. If we limited ourselves to one kind of dials
we would avoid few problems but the world of dialing would not be so
fascinating. This is incredible how many ideas were introduced into
sundials and every new design is a challenge for its creator how to solve
At 03:56 PM 7/31/96 +0200, you wrote:
Sorry, I wrote abstinence and meant absence.
In Polish the default meaning of abstinence is from alcohol, in American
English - from sex, what about English (in America called British English
by the way in order to distinguish it from English that is
At 05:33 PM 8/14/96 -0500, you wrote:
I am a sundial enthusiast an have been an on-looker of this list for somew
time. Now I need some help from all of you. I am planning on getting
married in september of 97. I hope to get married on the equinox
(autumnal) I would like to know the exact time of
Bart
I think you owe to us announcing your decision. This is the first topic
since I joined the list (in July) that arose some interest or rather broke
shyness. But after all the discussion it is really becoming interesting what
you are going to do.
All best to you and your fiancee
- Slawek
At 12:30 AM 8/17/96 -0700, you wrote:
Slawomir K. Grzechnik wrote:
one year earlier or later does not make much difference if
you plan your marriage for life.
Boy, does THIS sound like it comes from a bachelor! (Aside from that,
Mrs. Bartman, how did you like the wedding?)
I am far from being
Hi Hans
At 11:48 PM 8/19/96 +-200, you wrote:
With great interest I've read the article of Mr.Bartmann about making
sundials using a spreadsheet program (reference in 'sundial links' WWW-page).
Could you give the URL? I could not locate it. Using spreadsheet for
repetitive calculations is very
The discussion on Millenial Sundials died. I think that unless we have
influential members on our list we cannot hope for many investors funding
special sundials because of the start of the Millenium. It is still good
that sundials are being built at all and not only by private persons.
I think
At 10:59 AM 9/9/96 PDT, you wrote:
Are there references to the use of sundials in navigation?
In the days before magnetic variation was mapped, they must have been useful
(with the limitations of stability that a dial on board a ship would have.)
No doubt travellers on land used them, are there
At 02:19 PM 9/16/96 METDST, you wrote:
Dear sundial subscriber,
Someone suggested earlier on this list that a sundial on the
southpole would have some interesting features.
This made me think of a question that I have had for a
long time and up to now, I did not find anyone that had
a sufficient
will try to remember to
sort it out tonight (but as I've said, my memory..).
Peter Tandy
On Tue, 17 Sep
1996 00:46:08 -070, Slawomir K. Grzechnik writes:
Thanks Peter. I know that there was some doubt about reaching the North Pole
by Peary in his own time. Fortunately such doubt never
Date: Tue, 17 Sep 1996 20:05:55 -0700
To: Michael Dworetsky [EMAIL PROTECTED]
From: Slawomir K. Grzechnik [EMAIL PROTECTED]
Subject: Re: location of north pole
Hi Michael
Thanks for references. National Geographic is easily available. I do not
know about availability of The Daily Telegraph
Hi
Just few words more. I do not think we have any material to prove or
disprove Peary's reaching the North Pole. There are only few institutions
that could do the investigation professionally and possibly fairly and we
know that this is very hard. This is unbelievable but fairness sometimes may
At 12:35 AM 9/27/96 -0100, you wrote:
One of the fascinations of dialling for me is the still-unexpected richness
of the field, going beyond, as it does, the simple matter of an alternative
to a clock. On this latter point, a clock is used for telling the time but
also for measuring elapsed
At 10:22 PM 1/4/97 -0500, you wrote:
To set my digital watch, I dial 1-202-762-1401. This connects to the U. S.
Naval Observatory Master Clock (voice).
Mac Oglesby
In case you have to use radio:
1. BBC World Service on short waves has the coverage for the whole world (I
mean Earth). The GMT
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