Thank you, Frank and also Roger; that sounds quite plausible.
Really, the eye plays the same trick sometimes. At night, a street lantern
will often appear to eat up the top half meter of its supporting pole. :)
Rudolf
52.5N 4.7E
-Oorspronkelijk bericht-
Van: Frank King [mailto:f...@cl.cam
– and not just lately –, but this effect
amounts to about 17 microseconds each year on average, and would only
necessitate an extra leap second every sixty thousand years or so. The
day-to-day fluctuations are much larger than this.
All the best,
Rudolf Hooijenga 52.5N 4.7E
Brooke
Thank you Damia,
What a fun thing to do. I am glad the declination bug was sorted out.
I am now looking at four different sundials and they all seem to work as
accurately as I could fold and glue them. Next, I will try a window sundial.
Now to find a way to keep the style triangle square to the
Hi everyone,
Although getting on for time here in Europe, I suppose it is never really
too late to wish everyone a Happy Pi Day!
http://en.wikipedia.org/wiki/Pi_Day
Rudolf
---
https://lists.uni-koeln.de/mailman/listinfo/sundial
Hello toves,
quote from text below..
"At this level of accuracy, what is meant by the "position" of
a station starts to get lost in the noise of the planet's shape."
There are (of course) programs that will try to tell you to the nearest
inch what the distance is between any two points on
Hello all on the List,
I received this email on my private email account and thought I'd forward it
to the list. Perhaps someone might like to have a look into this question.
For all, happy days in whatever suitable way!
Rudolf
--- quote ---
From: N.Ravichandran [mailto:[EMAIL PROTECTED]
Hello
Peter,
I don't know what one is either, however it occurs to me that Aton, in
ancient Egypt, was the Sun god.
Perhaps the sundial was called "sun-***" where *** is the Plekh part. The
Greeks could have borrowed the word from the Egyptian language.
- Original Message -
From: "Peter Tand
Thank you Fred for this great link.
I found the first two sundials on this page myself when in
Oslo in 2000.
I did not speak Norwegian then. I do now, and it is great to
pick up sundial-related expressions this way to add to my
vocabulary.
Thanks!
Rudolf
52-30N 4-40E
- Original Messa
Thank you for the description, Fred.
However, somehow I felt knew this already, so I must have been
in the program somewhere.
When in the main screen, hit F1;
then, select Dates and Times.
Ah! _That's_ where I've got it from.
great program, that... thank you Fred, and Bob.
Rudolf
-
Bill,
Thank you! What rapid service!
I can now easily see if I have input the date correctly. I had a hunch that
my Windows country settings were turning date and month around, and this is
indeed what happens. Now, it's no problem anymore because I can check.
Great!
Rudolf
- Original Message
at noon, less than 40 degrees
now (only 14 in winter, poor us). The distance between the top of the string
and its shadow is then not very much longer than in the evening (or morning)
for the same shadow length.
But of course, with higher noon sun, you are no doubt correct.
Regards
Rudolf Hooijeng
Tony,
thank you for your prompt reply. I'll have some digesting to do!
There are always scraps of aluminium in the workshop, so I shall "work" on
these first, and see what happens.
Not that it has anything to do with the above, but I was asked to prepare a
10 minute lecture on any subject NOT re
Hello Tony and other readers of the list,
either I was not subscribed then, or I skipped it because I was not going to
work on aluminium,
but I would be really interested in a repeat now. Would you please?
Thank you,
Rudolf
52-30N 4-40E
- Original Message -
From: <[EMAIL PROTECTED]>
(..
Mario,
I don't know about the others, but I would be interested to see your answer
as well.
This is something I know very little about, so your views would be valuable,
perhaps to more people on the list.
My best regards,
Rudolf - 52.30N 4.40E
- Original Message -
From: "Mario Arnaldi"
quot;Sundial of the month" columns, I am always
learning, so.. fire away.
- Original Message -
From: "Rudolf Hooijenga" <[EMAIL PROTECTED]>
> I have placed a summary of the Zonnewijzerkring Bulletin 02.3 on my
website.
>
-
Greetings, sungazers!
I have placed a summary of the Zonnewijzerkring Bulletin 02.3 on my website.
Late, as always, but still nice to have alongside your paper copy.
The Zonnewijzerkring, or Dutch Sundial Society, was founded in 1978 and so
celebrates its 25th anniversary this year.
Check for
Hello Anselmo and all readers,
> Don't you think it'd be better to call the equinoxes 'ascending
> equinoxe' and 'descending equinoxe' instead of 'vernal equinox'
> and 'autumn equinox'? Do you know if the International Astronomy Union
> said something about this?
All I can find in a quick searc
Hello fellow sunggazers,
I am happy to announce that, after a silly incident in which I broke an
ankle and disfigured my poor nose, everything is almost back to normal.
This weekend the new Bulletin (2002-3) was sent to our members. At the same
time, the English(-like) summaries of both the 2002
Hi all,
I didn't receive the pdf, but apparently some others - not all - did. Any
thoughts?
Willy Leenders wrote:-
>Hi Roger,
>Thank you for sending the sketch "DST Epicycle.pdf".
Willy, would you send me a copy of the pdf? Dank je wel!
Rudolf
52-30N 4-40E
- Original Message -
From
Hello Tony,
the pictures sound quite good. Could you possibly squeeze me onto your
mailing list as well?
Thank you very much.
Rudolf
- Original Message -
From: "Tony Moss" <[EMAIL PROTECTED]>
To: "Sundial Mail List"
Sent: Saturday, June 15, 2002 9:20 AM
Subject: Images
> Fellow Shado
Sorry, for some reason it will not work like this.
Meanwhile, just go to
http://world.altavista.com
and just fill in (or paste) the url
http://www.astroexcel.de/index.htm
in the spot provided and choose German to English (or something else)
;-)
- Original Message -
From: Rudolf
John (and possibly others), you could try this trick:
http://world.altavista.com/urltrurl?lp=de_en&url=http%3A%2F%2Fwww.astroexcel
.de%2Findex.htm
It will take you to the Altavista translation site, with the URL and the
languages already filled in. You will get sort of a translation.
You can als
Good morning (or to taste/location),
Wanting to check sunrise/set, I cannot seem to get the naval observatory on
http://aa.usno.navy.mil/
in my browser. I thought this was the newest site they were on.
Any ideas?
Best regards,
Rudolf
Hello all readers,
I have just placed my English-language summary of the 2001-3 Bulletin of the
Zonnewijzerkring (Dutch Sundial Society) on my homepage.
If you like, please visit www.rhayward.demon.nl and follow the link for
Summary 01-3.
There is also a link to the homepage of the Zonnewijzerkr
Hello John and indeed all readers of the list,
somewhat less important but because I found it nicer to look at,
I "un-distorted" the photograph of my house (the one that is on my
homepage, see below) this way.
It was taken from a truck for a good overview, but that had made verticals
go wide
Hello all,
I have uploaded the summary of Bulletin nr. 76 (2001-2) to my homepage.
To my horror, nr. 75 was not there- I must have completely forgotten to
upload it.
I have uploade that, too (2001-1).
Converting from Word to HTML I received an error message about some language
page or other. Cl
As for "Oughtred", I never gave it a thought, always having assumed it was
"Ought" as in "you ought to do this" plus "red" as in the colour.
A famous family of packet drivers for (among others) Ethernet cards comes
from a firm called Crnwyr.
Just to be on the safe side, there was a .wav file on
Please check out the following site:
http://www.badastronomy.com/bad/tv/foxapollo.html
where the author has taken the time to debunk every single hoax claim. A
good read, even if some of it is obvious to most of us on the list.
Of course a sundial will work. But with no atmosphere, a guy in a wh
Which reminds me of an attractive puzzle I once saw in Wireless World.
Suppose you have a lot of pieces that fit together to form a hollow sphere.
Think for example of the patches that make up a soccer ball, only thicker
perhaps.
Suppose further they are all magnetised (magnetized?) with N on wha
Great..! I suppose it will be implemented as of Sunday next? ;-)
Rudolf
- Original Message -
From: Ron Anthony <[EMAIL PROTECTED]>
To:
Sent: Monday, March 26, 2001 8:07 PM
Subject: New California DST
> All,
>
> The other day I heard on the radio that some politcians has proposed a
Hi Dave and all other readers,
Thank you for the kind responses.
Actually, the numbers are just the page numbers of the original paper
bulletin. This makes for easy reference.
The summary covers all the articles in the Bulletin.
You may note that my summary is always one issue of the Bulletin beh
Hello fellow sungazers,
I have just put an English-language summary of Bulletin 00.3 on my homepage.
To make it more interesting, I added some of the pictures. Hopefully it does
not slow down your connection too much.
Feel free to have a look on
http://www.rhayward.demon.nl/
also, if you encou
Hello sun worshippers,
Another example of the "round shape on the dial face no matter what the
time"
discussion:
Almost all of the sundials in the Deutsches Museum "Sundial garden" have
circular disks on top of their gnomons.
The disks are parallel to the face on which their shadow is read, and
Bill,
I would certainly like to have a look at it, but don't normally have access
to the Compendium. Can I find a picture of it somewhere on the net?
Thank you very much,
Rudolf Hooijenga
[EMAIL PROTECTED]
- Original Message -
From: <[EMAIL PROTECTED]>
(...)
> On
Hello all on the list,
In my "Is this a sundial?" posting, I said it was in Israel. Wrong, wrong! I
was completely mixed up on that.
The stone is in the museum (the former gatehouse) of the Boyle Abbey ruins
in Ireland.
Interestingly, Mario Arnaldi hit the nail on the head; he spotted my mistake
Hello all,
A 12K picture is attached, I hope that's OK.
My parents visited Israel last year. A guide thought it was some sort of
sundial so my mother took this photo for me.
If it is, I sure don't know how it worked. If it isn't, what could it be?
Any thoughts out there?
Rudolf
Attachment con
Yes, yes yes! Laying out lines is really fun and healthy.
To derive the meridian from the east-west line, you don't even have to use a
Pythagorean triangle.
If you peg two points on the E-W line (not too close together) and connect
them with a long rope, you can pull the rope taut first on one si
It is rather a late reaction, but I thought you might enjoy the following
observations:
Echoes by stairs
"I would like add to this a rather remarkable observation that I did when I
was at Chantilly de la Cour, by the equestrian statue. A stair of ... steps
descends into the garden, where a founta
Fer, congratulations with the Sawyer Dialing Prize !
On the Roman Surveyor's problem, I can add to Fer's article the summary that
I made of it.
I have added the pictures of Fer's article to the summary.
It is on
http://www.rhayward.demon.nl/sundial/sum99-4/sum99-4.htm#Roman
Some days ago, I ha
>From William Lee Kennon, "Astronomy":
-quote-
The actual values of the equation of time from day to day throughout the
year will depend on the point where the real sun and the fictitious sun are
made to coincide in right ascension. It is desirable that this point be so
chosen that the values of
This is amazingly interesting stuff! It carries archives of lots of other
lists that are likely to interest us as well. Thank you for the pointer!
By the way, I noted you can also use the address:
www.astroarchive.com
Rudolf
- Original Message -
From: Mac Oglesby <[EMAIL PROTECTED]>
>
When I wanted to make a sundial for my mother-in-law, I had a nice slab
polished and the tombstone maker glued a kind of sandblast resistant rubber
on it. The polishing was done so smoothly that the rubber held well, but it
would not have shown a shadow at all well.
I then drew the artwork on the
Hello All-on-the-List,
to my surprise, I find I will be almost a week longer in Oslo than I had
anticipated. This does mean that I wish I had prepared for the trip rather
better than I have, dialwise speaking.
And so.. the obvious question.. Where does one go dial-hunting in or around
Oslo these
Hello good sunwatchers,
As Fer kindly pointed out to me, the link to the new Bulletin 99.4 summary
did not work.
As far as I can tell I have fixed it (which is not all that easy from a
hotel room at hotel telephone rates ;-) ), at least, even after purging the
cache, the summary page will now d
For those of you who read German (wow, the load on
the Net seems a lot lighter now?):-
This is a book that will really tell you how to
read a sextant and how to use the Almanac or your pc or calculator to fix your
position. It even includes some Almanac pages so you can work the
exercises.
Sundial lovers,
for a time now I had the summary of De
Zonnewijzerkring Bulletin 99.4 ready. Only now did it occur to me that you might
want it on my web page.
I have taken the liberty to put a new picture of
myself on it, standing next to a Berhardt sundial.
Also a photo of our local scare
The "true" sunrise happens when you can already see the sun. At "true"
sunset, you can still see the sun. (assuming other conditions to be
helpful).
Under "normal" circumstances, the lower limb of the sun will be seen about
2/3 of a sun's diameter above the horizon at the times of astronomical
sun
Could not the EOT have always been detected by comparing observations on
stars with solar time? Astronomers would know about the 366 vs. 365 days per
year, but would notice slight variations about even that - the EOT.
I would be surprised if, say, Hipparchus had not know its value.
- Original
This is one for my private word list:
what is a "Tyro" ? Of course I understand the meaning from this sentence,
but where does the word come from?
--
> It could be worthwhile having a short section on what to look out for,
> and what to avoid, if a tyro is thinking of purchasing o
- Original Message -
From: Krzysztof Kotynia <[EMAIL PROTECTED]>
To: Rudolf Hooijenga <[EMAIL PROTECTED]>
Sent: Saturday, September 25, 1999 11:34 AM
Subject: Re: Equation of Time Graph wrong way up Down Under ?
> > While that in itself is commendable, I re
e, and "Sundial Fast"
on the November (+) side, I think the users and passers-by will have no
difficulty interpreting the meaning.
If this is also the "Astronomical" way of doing it (and it is), so much the
better :-)
Rudolf Hooijenga
[EMAIL PROTECTED] (home)
[EMAIL PROTE
aper later. However, amateur that I
am, I have to divide my time between several issues.. it will be a while.
Rudolf Hooijenga
[EMAIL PROTECTED] (home)
[EMAIL PROTECTED] (office)
Hello Loy,
well, I am sure you know all about large attachments now..
In the debate, we forgot to say HELLO and WELCOME to you. Of course everyone
wishes you good luck in your new career.
I like the idea of the box dial, by the way.
Rudolf Hooijenga
[EMAIL PROTECTED] (home)
[EMAIL PROTECTED
> - Original Message -
> From: Roger Bailey <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>;
> Sent: Saturday, September 11, 1999 6:50 PM
> Subject: Re: Formula to calculate sunrise
> The easy, elegant formulae that you can use to determine sun rise and set
> phenomena are:
>
> Sunrise t
-
From: Frederick W. Sawyer III <[EMAIL PROTECTED]>
To: Rudolf Hooijenga <[EMAIL PROTECTED]>
Sent: Thursday, September 02, 1999 12:32 AM
Subject: Re: A dial by any other name...
Rudolf,
The following notice appears in the current issue of The Compendium. It
may be what you are
Thank you Lufkin,
it's a pity one cannot do it, but your information saves me a lot of time
looking!
Rudolf
- Original Message -
> Unfortunately, there is no way to control the size of Excel graphs other
> than with the mouse. Even Visual Basic for Applications (which allows
> almost to
Hello all,
I don't know if I have asked this before, but anyway, Tony made me think of
it again.
Is there anywhere available a word list for sundial topics?
The usual Internet search engines are less efficient for this one, for lack
of throughput?
What I need most (for my English-language summar
Dear All On The List,
In Microsoft's Excel I can easily plot X-Y pairs,
so that I can lay out, for example, an analemmic dial.
By fiddling with the mouse I can stretch the graph
until it looks about right. See attachement (5 kB, hope that's ok).
It would be nice, though, if I could just i
Ops... forgot the attachment.
This is what I meant.
It looks about allright, but can I specify the X and Y axis lengths?
Regards,
Rudolf
Attachment converted: MAC Hard Disk:ana.gif (GIFf/JVWR) (0001A3BB)
Dear fellow gnomonists,
I am happy to inform you that the new summary,
99-2, is on my homepage.
It even has some pictures in it. Please have a
look and enjoy our Bulletin even more!
Homepage:
http://www.rhayward.demon.nl
Rudolf Hooijenga
[EMAIL PROTECTED]
[EMAIL PROTECTED]
Hello fellow dialists,
for those of you who have difficulty deciphering Dutch and want to know if
that's bad or okay, I have started (last year) to make English language
summaries of our journal.
For what it's worth, I made a web page where you can find them. Nope, the
newest one has not been don
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