set available for local
installation on members' PCs? It's quite modest in size, for any recent
application, and would be directly accessible to any browser, without
going on line...
Dave Bell
Looking closely at the photo, I saw some interesting details:
Below the water-filled 'gnomon', there is a semicylinderical, angled
wall, apparently to catch the index spot. (About 2 radii from the center
of the cylinder)
Why is there a gap in the wall, about noon (1300 Summer Time)?
Above
On Tue, 25 Apr 2000, Ron Anthony wrote:
Fer,
You are right about the error. Originally I had -(dEpsilon), but wanted to
clean it up.
This is a good example of the differences with call by reference and call
by value. I believe the default is call by reference, which means the
address
-scale to the adjacent row, and 5 columns, each with a different ratio
of central obstruction radius to outer radius. I haven't had a chance to
test them yet, as it's somewhat hazy here today; maybe later!
Dave Bell
N37.28W121.96
http://dialist.webjump.com/
http://www.crosswinds.net/~dialist/ (Once
There is a difference, besides the use of PR instead of PA, as Ron
pointed out. (I believe both are supported, in each language. The
substitution of smeicolons for carriage returns is common, also.) If you
look closely, you will see that the order of the arguments coordinates,
for the most
I'll go for one, Ron...
Let me know when, how, how much, you want!
Dave
On Mon, 27 Mar 2000, Ron Anthony wrote:
All,
PLEASE NOTE: Version 4.0 For WindowsT 95, 98, NT(4.0), or 2000
NO WINDOWS 3.1 or MAC.
DeltaCAD has two offers:
Standard Quanity discount: 10 copies bought at
number 1729 and remarked that the number seemed to me
rather a dull one, and that I hoped it was not an unfavorable omen.
'No,' he replied, 'it is a very interesting number; it is the smallest
number expressible as the sum of two cubes in two different ways.'
Dave Bell
N37.3W121.9
!)
Dave Bell
W121.9N37.3
-plotted paper. (I'm sure
their paper spec is quite different from common plotter paper!) Except for
universal designs, dial manufacturing wouldn't profit from quantity
production, unfortunately...
Dave Bell
W121.9E37.3
. A combination of
the two would be really, really nice!! :{)
Dave Bell
W121.9N37.3
On Tue, 15 Feb 2000, Gordon Uber wrote:
Third minutes (sixtieths of second minutes) are not in common
use, although I would note that the third minute of an hour is the period
of U.S. power main standard 60 Hz alternating current. Coincidence?
Hmm... Surprised I never noticed that!
, not 1 arc minute.
However 4.848 microrad = 1 arc second, or approximately 5 microrad.
You may be thinking of 1 arc mjnute = 0.2909 mrad
Gordon
At 02:13 PM 2/15/00 -0800, Dave Bell wrote:
Whups! You meant a *degree* is ~17 mRadian, didn't you? An arcsec is very
close to 0.3 mR or 300 uR
On Mon, 14 Feb 2000, The Shaws wrote:
Actually, the old UK length system is a curious mixture of decimal and
non-decimal
Start with a mile
Take half = half a mile = 880 yards
Take half = a quarter mile = 440 yards
Take half = 1 furlong = 220 yards
Then, here is where horse racing
On Fri, 11 Feb 2000, John Carmichael wrote:
Since the calculation of arcseconds is a bit complicated, what would help
would be some sort of precalculated table which would give the maximum
readability distance for different shadow widths. For example, the table
might say that a 1/4 inch
On Thu, 10 Feb 2000, John Carmichael wrote:
Hi Chris:
You're right! I realized as soon as I sent my message that a small diameter
floodlight with a wide beam would be better than a tight beam, because it
must illuminate the entire style and not just a portion of it.
Also, the smaller
mechanism), and I published a cheap-and-cheerful small version in the
BSS Bulletin October 99.
John:
Are you at liberty to re-print that design for us, say to put up on the
archive sites?
Dave Bell
, especially in the winter...
Dave Bell
N37.28 W121.96
Hi, Gianni!
On Mon, 24 Jan 2000, Gianni Ferrari wrote:
I attach a different example of Monofilar Sundial , realized with the
program SUND98P : vertical plane declining 40 West; the pole is horizontal
(f.e. the edge of a balcony) and the date lines are vertical straight lines.
I see how
On Sat, 1 Jan 2000, Colin Davis wrote:
1,1,[EMAIL PROTECTED]
Iam Millemium compliant hope you are@@
73 88 de
colin and co
Well, *I* won't know if I'm Millenium-compliant for another year (+7 hr),
but I see that you are at least Y2K-compliant!
Have a great New Year!
Dave
On Wed, 29 Dec 1999, Fernando Cabral wrote:
As to the loop, it seems things like
for ( ; n ; ++n)
mistifies more than any otherthing with the probable exception
of things like
a = a ? b : c;
- fernando
Or: a ^= b ^= a ^= b
Dave
D'oh!!
On Wed, 29 Dec 1999, Lufkin Brad wrote:
the semi-colon is on the next line!
-Original Message-
From: Fernando Cabral [mailto:[EMAIL PROTECTED]
Sent: Wednesday, December 29, 1999 11:25 AM
To: Dave Bell
Cc: sundial@rrz.uni-koeln.de; Slawek K. Grzechnik
Subject: Re
On Mon, 27 Dec 1999, William P Thayer wrote:
Of tangential interest to some, this page I?just found, by a namesake (not
me):
http://www.jug.net/wt/danielle/F.htm
They ask for the length of the shadows; I?think they're in over their heads...
Especially since they got the triangle
Hah! That's exactly the outlook my wife accuses me of!
On Fri, 24 Dec 1999, Jack Aubert wrote:
What use is any of it if you can't connect to the Internet?
Maybe you'll survive for a while, but what kind of life will it be?g
Jack
At 12:30 PM 12/22/99 -0800, Dave Bell wrote:
In all
On Wed, 22 Dec 1999, Jim_Cobb wrote:
Has it occurred to anybody else that many proprietors spreading
prophesies of gloom and doom come Jan. 1 are gladly peddling food,
water, battery-powered generators and other expensive wares on credit?
-- John McCaslin
True! And
On Sat, 4 Dec 1999, Daniel Lee Wenger wrote:
I wonder if anyone in this group knows of software that converts a
Word file to a gif or jpeg
or a
postscript file to a gif or jpeg
or a
PDF file to a gif or jpeg.
Thanks for any help.
Dan Wenger
Daniel Lee Wenger
Santa Cruz, CA
By my reading, the dial in the photo indicates just barely after local
noon. The helix is aligned with the Earth's axis, and it is in the
northern hemisphere, so North is to the left. The Sun is shining on the
band so that the shadowed portion looks just slightly shorter than the
lighted
incorporate that detail?
Dave Bell
On Thu, 14 Oct 1999, David R. Gagnon wrote:
Dear Anton
Regarding the use of the Schmoyer sundial in the Southern hemisphere:
There are no markings cast-in on the sundial castings except for the
name of Richard L. Schmoyer on the backside of the gnomon
Announcement:
David Gagnon has sent me a set of images of the Schmoyer Sunquest dial,
to post on my archive page. Visit the site at:
http://dialist.webjump.com
I have three links there, so far, and Dave's pages should be clear...
Dave Bell
On Thu, 23 Sep 1999, Planocka Vit wrote:
I have recently noticed an offering on ebay.com of an interesting
device, a solar slide rule that should predict the time and azimuth
of the sunrise and sunset for a given location. (I actually think
that it shouldn`t be called a slide rule, just a
a day or so to set up, but I will announce it soon.
Dave Bell
[EMAIL PROTECTED] (note that this is a pseudo address. If you
use this for sending me the above, it will
be easy to keep separate from other mail!)
Hmm - this sounds remarkably like the commercial globes I saw a couple
weeks ago at a warehouse discount chain here (Costco / Price Club)! They
were maybe 10 diameter, and I remember them being reticulated in brass,
but whether the lines were lat/lon or borders, I don't remember. Tagged at
On Fri, 10 Sep 1999, John Carmichael wrote:
Hello all:
I've got a little simple question that I'm not quite sure how to answer.
What would be the correct definition of the type of time shown by a sundial
which is longitudinally corrected, but NOT corrected for The Equation Of Time?
On Fri, 10 Sep 1999, Lufkin Brad wrote:
I'm impressed that you chose to program in PostScript. Why not a more
user-friendly language? Just wondering
From: john hoy
Subject:paper equatorial dial with pencil gnomon
I have rewritten my equatorial dial in native
On Thu, 9 Sep 1999, Lufkin Brad wrote:
I wanted to announce a new release of my Sundials program for the Macintosh.
I'm working on a version for the PC, using the same code base and having the
exact same features, for release soon.
Regards, Brad
... with bated breath!
Sounds great, Brad!
Alexei:
Hit the German Space Operations Center, and enter your locale specifics.
Bookmark the page you go to when you hit submit, and use that for future
searches:
http://www2.gsoc.dlr.de/scripts/satvis/detailform.asp?
lat=35.8870lng=14.4030loc=MdinaTZ=EET
(combine the long lines above, and
subscribing through HotMail, NetAddress, or the like. With these, only
the header is displayed, until you select a message to open. There is an
added burden of graphics and (small) advertising banners with these, but
they still may be an economical solution.
Dave Bell
On Tue, 7 Sep 1999, Malcolm Purves
On Sat, 28 Aug 1999, Peter Abrahams wrote:
Used for timing meridian passage of the sun, accurate
to a few seconds. It was a simple device, a hollow 90 degree prism, 2
sides silvered. At meridian, two images of the sun - one from glass side,
one reflected off both mirrors - would coincide.
On Sat, 24 Jul 1999, John Carmichael wrote:
But beware! I found out a while back that most copiers will not reproduce a
copy to the exact size that you program it to do. Yesterday, I showed the
surprised manager of Kinko's (a respected fotocopy shop) that when we
fotocopied a 16 ruler at
90 degrees?
On Mon, 19 Jul 1999, Charles Gann wrote:
Greetings fellow diallers,
This is a bit simple, but I thought it fun anyway.
From almost every point on earth, a person can leave their home,
travel north a given distance, then travel east the same distance, and
finally travel
Wonderful story, Tony! Often, the obvious theoretical explanation is
just shy of the mark...
So much for theory! :-)
I'm reminded of making toy paddle boats with children of the sort where a
rectangular notch is cut at the back of a plywood 'boat' and a cruciform
paddle is driven in the
On Thu, 24 Jun 1999, Arthur Carlson wrote:
Tony Moss wrote:
I found a couple of web sites on signal mirrors.
http://www.equipped.com/signal.htm#ReflectionsOfLight
describes how they work and how to use them. I also made a sketch of how
I think it works. The attached bit map file shows
On Mon, 17 May 1999, John Carmichael wrote:
Hi Ross:
Getting a small, very long focal length lens (or mirror) to replace the
pinhole
can solve the problem, at the risk of introducing some image aberrations,
including chromatic, visible at the edges of the solar disk. This was of
course
On Sun, 16 May 1999, Chuck O'Connell wrote:
The most unusual way I've ever seen sunspots is *directly*.
I was driving west at sunset on an *extremely humid* hot
august evening. As my car crested a hill the
sun was sitting on the horizon, *easily* viewable because
it was so washed out by
On Wed, 5 May 1999, Phil Pappas wrote:
Hello dialists:
I conducted over thirty different experiments using all sorts of hole,
crosshair and bead diameters. The objective, of course, was to find the
style which cast the smallest point of light or shadow onto the analemma.
The design
-boggling!
John Carmichael
Tucson
website: http://www.azstarnet.con/~pappas
Dave Bell
On Fri, 30 Apr 1999, Jim_Cobb wrote:
why don't you Anglophones try the metric system?
- fernando
Perhaps you should consider us bilingual in terms of units.
Technically inclined (and many other) Anglophones use both English and
SI units with comfort, though we prefer one set for some
On Fri, 30 Apr 1999, Fernando Cabral wrote:
Now, I hate when I see something like 2 yards, 2 feet, 5 inches and
(the stroke of mercy) 1/8 -- It takes me several seconds to figure out
how tall that person is!
Or when I see specifications such as:
Torque wheel bolts to 50 foot-pounds (6.9449
On Fri, 30 Apr 1999, Fernando Cabral wrote:
By the way: does stroke of mercy make sense in English?
Yes, but we really never translate it - from the French! Coup de grace
Now I am sure it makes sense. But if I were to say coup de grace
I would be accused of suffering of francophilia.
On Wed, 24 Mar 1999, John Pickard wrote:
Roger's comment re sun compasses is correct and also applies
partially to Antarctica.
|
|
Of course, GPSs have ended all that!
John
But GPS still makes it a pain to lay out a N-S line, unless you have a
very long baseline, or a very high
On Tue, 16 Mar 1999, John Pickard wrote:
When I was a kid at school more years ago than I care to remember, I
was taught that Lieutenant James Cook RN came out to Australia in
1770 (or was it 1772??) to have a look around, and also to observe
the transit of Venus in Tahiti.
So my
On Sat, 13 Mar 1999, Jack Aubert wrote:
But isn't it literally wrong? As long as there are 60 minutes in an hour,
how can 24 of them vary at all?
Les dur?es de vingt-quatre heures egalent toujours 24*60 minutes...non?
N'importe le p?riode de l'ann?e.
I think it's just a case of unclear
Fred and Tex:
After reading the exchange on here today, I went back and re-read Fred's
Compendium article, looking closer at the development of the gnomon shape
as a cycloid. Sketching the path of a point on a circle, rolling on a
line, I see the gnomon's shape (convex away from the line) as
From Fred Espenak's wonderful Eclipse Pages at NASA, I found the following
two solar eclipses in 1582. The first was total, but of quite short
duration (and) low magnitude, with the maximum 110 degrees East of
Greenwich. The second was Annular, with it's maximum in the southern
hemisphere.
I meant to include the URL for the Eclipse Pages:
http://sunearth.gsfc.nasa.gov/eclipse/eclipse.html
Dave
On Sat, 20 Feb 1999 [EMAIL PROTECTED] wrote:
Regarding Jim Morrisons request for lunar eclipses in 1582. I ran an
astronomical simulation for 1581-1583. There were no (umbral) lunar
, considering the source to be far beneath you,
Fernando, and hang in here with the rest of us who are not afraid to admit
we don't know everything!
Dave Bell
On Fri, 18 Dec 1998, Jack Aubert wrote:
IMHO, the bottom line on wood-for-sundials is that wood is basically an
unsuitable medium for this purpose, however there are some synthetic panels
which have woodlike properties and may contain some wood that could work
quite well.
I once stopped
On Fri, 28 Nov 1997, Tom Kreyche wrote:
Seattle's long and rarely sunlit winter has begun in earnest.
Or, as a tagline on an astronomy list has it:
Where the Sun is considered a deep-sky object!
I'm experimenting with building dials and want to test the ability of
different gnomon designs
On Mon, 22 Sep 1997, Thibaud Taudin-Chabot wrote:
Warren,
I don't get it. A horizontal gnomon can only indicate the heigth of the
sun, just like a vertical gnomon can only give you the azimut.
---
Thibaud Taudin Chabot,
On Thu, 16
Jan 1997, Rik Hill wrote:
The city of Ghent (Belgium) plans to place 4 sundials on one
of the chimneys of the town hall. The surfaces of the dials
will be squares, with sides 1.5 m. They will be placed about 35 m
above the ground..
I am a bit confused
computations only support the
range of 1/1/1900 = D = 12/31/2078...
Dave Bell
For those interested in databases of place names and geographic
locations, I've tracked down a couple more very useful sites.
USGS Geographic Name Information Serve (GNIS) can be
searched through a form at:
http://www-nmd.usgs.gov/www/gnis/gnisform.html(talk about redundancy!)
A very nice
I've long used the University of Michigan Geographic Nameserver
via telnet at:
telnet://martini.eecs.umich.edu 3000 or
telnet://141.212.99.9 3000
This is a very nice, text-based database of US locations,
down to VERY small towns. Population, zip code, lat/long, lots more.
I also found a
Right! I steered away from this one, as it is truly a map
server, rather than a table. On the other hand, it can let
you home in EXACTLY on someone's location, within a block
or less.
On the THIRD hand:
I looked up my location (Campbell, CA) at Martini.eecs.umich.edu 3000,
and collected the lat
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