Greetings to you both,
Another way I prefer to use, during spring and summer when the sun is north of
the equator, is to find the east-west line from the prime vertical (the great
circle passing through those points on the horizon and the zenith). If you
know the time of noon, then the sun
On 2012 July 8, at 02:16, Douglas Bateman wrote:
In fact the opposite requirement is essential for a watchmakers
workshop - that of a de-magnetising tool.
This has been a fascinating thread. Douglas' comment reminded me of
my mother's telling me about the days (the '20s) when she worked
I, too, looked at the transit. Some 60 years or so ago, I bought a
76 mm long-focus positive lens, something like f 16, which became the
objective of a very simple refractor for me. The instrument is long
gone, but I kept the lens, and mounted it in very ramshackle fashion
to project a
Thank you for these; they're grand!
John
John F Schilke, MD
jfs...@ipinc.net
N 45°.40 W 122°.65
---
https://lists.uni-koeln.de/mailman/listinfo/sundial
The American study of the 1769 transit of Venus is really
interesting. Thanks, Jim, for the link.
John
John F Schilke, MD
17440 Holy Names Drive, #502
Lake Oswego, OR 97034
503.636.0166 home
503.459.1213 mobile
jfs...@ipinc.net
---
In reference to the 1st Œcumenical Council (of Nicæa, 325), one very
important agenda item and decision was setting the rule for
determining the date of Easter.
(Just for completeness)
John
John Schilke, MD
jfs...@ipinc.net
---
https
14-jul-2011, om 20:55 heeft John Schilke het volgende geschreven:
Greetings!
As a matter of fact, this idea has been suggested in some detail,
including a patented New Zealand clock; there is even an iPhone
app for it. It is called New Earth Time, with midnight = 0º and
noon = 180º. See
available -- the guide didn't know them. I would be greatly
interested in learning more, too.
Best wishes,!
John Schilke, MD
jfs...@ipinc.net
122.65 W, 45.4 N
---
https://lists.uni-koeln.de/mailman/listinfo/sundial
Re the line on the surface of the Earth beneath the sun
Wouldn't it be a loxodrome, at least for short lengths of time, since
the angle with the meridian is nearly constant over, say, a day or so?
John
John Schilke, MD
jfs...@ipinc.net
On 2010 July 1, at 10:12, John Goodman wrote:
I'm looking for a simple formula which calculates the number of
hours that the sun will be above the horizon on the summer solstice
for any given latitude. I don't need to worry about refraction, or
take into account the sun's diameter.
On 2010 July 1, at 14:02, Willy Leenders wrote:
The formula of John Schilke is a good one when you divide the
result by 15
Exactly so; apologies! I forgot to copy that step.
John
John Schilke
jfs...@ipinc.net
---
https://lists.uni
over:
http://www.flickr.com/groups/1240...@n22/
I hope that others will add their photos, too.
John Schilke
jfs...@ipinc.net
45º 24'.0 N
122º 39'.0 W
---
https://lists.uni-koeln.de/mailman/listinfo/sundial
Hello,
I teach Latin, and should have some time in the next few days to
translate this somewhat stylishly, if you'd like. So far, what is
there seems to me correct.
Best wishes,
On 2008 April 23, at 12:57:03, [EMAIL PROTECTED] wrote:
I recently acquired a modern reproduction
On 2008 April 17, at 02:41:09, Linda Reid wrote:
... A suggestion - I have always thought it would be useful if I
could see pictures
of the members of our Mailing List, and so that I could put a face
to a name.
I have included a small photograph of myself. If other members
think
Several of you have requested details about the NASS Conference Tour and
Hotel. Fred Sawyer and I have worked hard so that this will be a great
conference and tour and we've finally finished the Motorcoach Tour
Schedule
with a description of stops.
If anyone would like to see a copy now,
Anselmo wrote,
First of all, my congratulations to Helmut and Roger for the
spreadsheet... and for releasing it
as freeware in these mean ;-) times where everything is under patent laws.
I heartily agree! Thanks to them!
One problem, though. I have downloaded the program to disk.
- Original Message -
From: Mac Oglesby [EMAIL PROTECTED]
... But how about the sundials on this web page?
http://www.kspgardening.com/sundial3.htm
Oh, my! (I can think of other uses for them, but then it's only
occasionally sunny in Oregon!)
John
122W36, 45N21
-
Greetings!
I'd like to bring to your attention a short but well-written and well
deserved article about the artistic dials created by Bob Adzema. It is in
the May issue of House Garden.
Congratulations, Bob!
John
-
Yes, here is the forwarded message.
John Schilke
- Original Message -
From: Ian Fletcher [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Tuesday, April 02, 2002 3:22 AM
Subject: Sundial E-Mail Protest
Dear Dr. Schilke:
Can you send out the following message to whatever mailing list
You all might find this of interest, brought to my attention because of
Easter.
http://solar.physics.montana.edu/YPOP/Classroom/Lessons/Sundials/equinox.htm
l
John
Content-Type: application/octet-stream;
name=The Equinox.url
Content-Disposition: attachment;
filename=The
Apparently, contrary to my intent, the web page also was sent as an
attachment. My apologies.
Happy Easter to all.
John
-
Greetings!
Dover Publications, of New York City, has just sent their February Catalogue
of Mathematics and Science. I thought that list members might be interested
to know that they offer (among many other things) the following:
Waugh, SUNDIALS: THEIR THEORY AND CONSTRUCTION, $8.95, and
. The
Japanese also drive on the left. Is there a trend here whereby left side
driving is only done on isolated islands?
What about India, formerly part of the British Empire? I am asking because
I really don't know.
John Schilke
122W36, 45N21
-
Well said! (Pace all white-ball devotees.)
John
- Original Message
They should just pick up the ball and put it in the hole.
Much more accurate and much cheaper.
It being my birthday, I appreciate this much. By the way, the ISO way of
writing it (2002-02-20) doesn't work so well, but we cannot have
everything -- as my son would say, where would we put it?
John
Oregon
- Original Message -
From: alexei.pace [EMAIL PROTECTED]
To:
But I can think of a simple but very precise way to level a tiny mirror so
that it is perfectly horizontal...
You could float the mirror inside a cup containing liquid mercury
Hello. John has a very interesting point, and I like Anselmo's idea of
mounting the mirror to produce a polar dial.
A very merry Christmas to all the diallists!
John Schilke
Yes, Fritz, my answers were along this line of thought. Do look at Judy
Young's neat reply.
Thanks,
John
Just imagining... I would say you could find out when
it WAS, but it would be quite impossible the first try.
When the shadow deviated to within about a week of
when you guess it might
Yes, one might also try the PayPal (.com) system.
John
... It should even be possible to
use your creditcard right from behind your PC.
Hello!
In perusing the current (Jan.) issue of Sky Telescope, I came across an
advertisement for a rather clever small solar telescope. It might be of
interest to some of the List members. Have a look at the Sunspotter.
http://www.starlab.com/
John F. Schilke, MD
Oregon City, Oregon, USA
Hello, all!
Bob Terwilliger wrote,
Perhaps the perfect balance is to join both societies and get the best
of both worlds.
He is quite right; I heartily agree! Best wishes,
John
Patrick Moore then asked if we could design a sundial, to be placed on the
moon at Tranquility Base - Joe Allen to be responsible for getting it
there!!
So, we have a challenge
Indeed! This is worth thinking over.
I regret that I don't know much about the Moon.
I guess with a day of
Greetngs!
This is from another list to which I belong. I know everyone knows
definition 1, but perhaps not the 2nd.
Best regards,
John
- Original Message -
From: Wordsmith [EMAIL PROTECTED]
To: linguaphile@wordsmith.org
Sent: Thursday, May 24, 2001 5:01 AM
Subject: A.Word.A.Day--gnomon
Amen!
John S
- Original Message -
From: Patrick Powers [EMAIL PROTECTED]
Message text written by Steve Lelievre
I'd like to know what other people think about the right convention to
use.
I don't think that it matters ONE JOT what convention is actually used so
long as the end
Dear Mike and All,
Plus, do your children know how to design a sundial? I know mine cannot,
computers or not.
My son, a computer expert, can, my daughter cannot, although she runs
circles (!) around me when it comes to working the PC.
BTW, does it not take twice as long to program the
Hello!
A few days ago I sent a brief story about watching an eclipse with
school children. If anyone is interested, it was on 1977 October 12. I
checked my diaries.
John
Hello!
Does the List have an archive? I lost the note I sent recently by pressing
the wrong button, and I'd like to retrieve it. If not, if anyone happens to
have it, could he please forward it to me. It is the description of tthe
camera obscura that I arranged for a partial solar eclipse
Dear Frank (and all),
Interesting message.
By the way, does anyone else still use a pocket calculator for sundial
calculations?
You'll be amused to know that I use an astrolabe, a hand calculator (Casio),
AND a slide rule to do the calculations. Much easier than programming, I
think, but
Dear Friends,
These are most intriguing photos and I am delighted to see them.
Several years ago we were fortunate to have a partial solar eclipse visible
from our town during the school day. Knowing of my interests in such
things, the principal of the school asked me to show it off to the
Hi, Frans, et al.!
Oh, yes, the day did start at noon, for astronomers. That makes good sense,
when you stop to think about it for a moment. Beginning with 1925 January
1, however, the convention was dropped in favor of the civil usage of
beginning the day at midnight, but the older usage
Splendid idea! Bravo!
8^)(John with beard)
- Original Message -
From: Tony Moss [EMAIL PROTECTED]
Al Pratt requested
But is there any other method of doing so which does not require some
additional data, like date, time, or something similar? Or is this the
only known
Greetings!
A reply to the notice that I had
forwarded to my brother-in-law, whom I am trying to recruit for
NASS.
I think it fun; perhaps you will,
too.
John
Original Message -
From: Mark Gingrich [EMAIL PROTECTED]
I'd like to tongue-in-cheekedly propose the following entry
Good move!
Mine arrived yesterday. It is a fine work of cleverness and workmanship.
Let me encourage you.
John
- Original Message -
From: David Higgon [EMAIL PROTECTED]
To: all sundial@rrz.uni-koeln.de
Sent: Wednesday, July 26, 2000 2:17 AM
Subject: Moonsticks to the UK
Dear all,
A good thought, John. I, for one, would want one.
John Schilke
- Original Message -
From: John Carmichael [EMAIL PROTECTED]
To: sundial@rrz.uni-koeln.de
Cc: [EMAIL PROTECTED]
Sent: Tuesday, July 04, 2000 7:57 AM
Subject: Glossary copies for NASS
Hello BSS members:
I'm wondering
Absolutely, Mac. This is a treasured book on my shelf, and Hamilton is
superb!
John
- Original Message -
From: Mac Oglesby [EMAIL PROTECTED]
To: Sundial List sundial@rrz.uni-koeln.de
Sent: Saturday, July 01, 2000 3:53 PM
Subject: Practical Astronomy by Mills
Hello All,
If you
Friends!
As you may recall, several of us were appointed to a committee to begin work
on a video for NASS. The idea is to produce one which would introduce the
subject of sundials to a wider audience, either by VCR showing or broadcast.
The project is indeed underway, and this is a call for
Oh dear!
Happy 2000!
John
Dear Mike,
I hope that you or someone will give us a precis of what these
shows are about, so that we on this side of the Pond can know what time
is!
Thanks for the announcement.
John
Hello, John!
Closely allied to this project is the Video project, as you know.
Just for information, I am awaiting a set of slides from the British S.
Soc. They will, I hope, be a basis for script writing for a Video. (The
BSS also prepared a video, which I have, and which I think we
Sounds good to me! And, hello, Mike!
John
122W36, 45N21
On Tue, 19 Oct 1999, The Shaws wrote:
The success of this wonderful sundial group was talked about a lot at the
NASS conference, and incidentally, it was great to put faces to some of the
people that I already regarded as friends, even
Yes, Tony, this is it, and I thank you very much for it.
All the best of wishes to you from the States!!
John
To the inquirer in or near San Antonio: you might like to look into
this. I have no connection with this company, but have one of their
watches, which (to all the diallists) does suffer from all the problems
encountered when one simplifies design. The workmanship, however, is
good, and
Dear John and the List,
I can only second the sentiments in your posting: the NASS
Conference was a true delight. It was a joy to attend, to meet you and all
the old and new friends, and to learn so much!!
As a one-time mathematician, I revel in the mathematical
articles, but
Dear Tony List,
I agree with this idea, and never having received it in the first
place, I'd be happy to have it.
Thanks,
Jon
I'm sure we all agree and sympathise with Paul but, from his intro', I
suspect Loy Chun is an overenthusisatic new member to the list who
Thank you for sending this note. It is a good reminder. Also, there are
perhpas others, who, like me, cannot receive attachments. Please keep
that in mind.
Again, thanks,
John
To pursue this thread just a bit further, does anyone know of a source to
buy any of these devices we've been discussing. It was so long ago that
I saw one that I'd have no idea where to start looking.
Thanks,
John
On Wed, 23 Jun 1999, Tony Moss wrote:
In my impecunious searches of WWII 'surplus' stores back in the 1950s I came
across a Portable Heliograph Set' in a pouch. It was simply a mirror about
four inches across with a sighting hole in the middle. A length of cord
attached it to a short
Hello, All!
Several years ago we were able to see a partial solar eclipse not
too far away from local noon. Knowing the principal, I asked him whether
he'd not like me to set up a viewing scheme for the grade school my
children attended. He agreed, and I covered all the south-facing
ECCLESIASTES 3:11.
John
On Mon, 17 May 1999, Tony Moss wrote:
Fellow Shadow Watchers,
This is 100% on topic and somewhat urgent for me.
The large bronze dial plate which I am about to engrave must bear the
biblical inscription
He hath made
And to me, too. Thanks.
John
On Wed, 12 May 1999, Giovanni BARBI wrote:
Dear friends diallists,
I feel a little ashamed, but I have consulted the book of Waugh and did
not find any trace of the SCHMOYER sundial of wich you are speaking.
So, is anyone able to give me the exact reference or
Since one major insurmountable objection to the Achelis-type
World Calendar, especially to Jews and other religious groups to whom the
preservation of the 7-day week is important, has anyone considered a
calendar of 364 days, divided just as in the World Calendar, but instead
of a
I believe her name is Elizabeth Achelis, and I recall reading her books
and a journal which she (and others) produced -- in the '50's, as I
recall. Now that you mention it, I, too have heard nothing about it for
many years.
As I recall, one major objection was the introduction of a break in
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