Mr. Karney:
Your new web site is an incredible resource, wonderfully put together and very
beautifully illustrated. I can't thank you enough for all of your effort to
make this available. Very nicely done!
Thank you!
From: Kevin Karney
Sent: Saturday, September 08, 2018 5:38 PM
To:
Hi.
I am looking for marketing feedback on a new sundial that I would like to
manufacture and sell. I call it the New Millennium sundial.
The sundial is an analemmic-equatorial design. It accurately shows clock time
to within less than a minute, the date to the day, and quickly adjusts
Hi Tony:
I understand in lime silos, where they convey the lime into the silo by
blowing it through a metal pipe to the top of the silo, that the 90 degree
elbows in the pipe would rapidly erode and fail. Then someone discovered
that if they intentionally built a small pocket into the outer
Hi Jon:
Here is another example, at www.swanstrom.net/sundial . It does require
some alignment action, you grab the analemmic plate on the front and face it
(within a couple of degrees) toward the sun, then read the time directly on
the equatorial dial.
It's fairly precise. For my
Hi Bill:
To determine offset of the
perceived shadow edge, I built a simple device consisting of a cardboard
testpattern, a white cardboard screen, and a stick to separate them about
36". The test pattern was two parallel strips eachexactly 1" wide
with a 1" gap between them. Over a three
a double-edged
gnomon such as a rod, cable, pinhole, slit, etc.
Thanks. Pete S.
- Original Message -
From: Pete
Swanstrom
To: sundial@rrz.uni-koeln.de
Sent: Tuesday, May 28, 2002 10:14 AM
Subject: Re: Shadow Sharpener Again
On a brightday with clear
skies, the perceived edge
Title: Re: Shadow Sharpener Again
blockquote, dl, ul, ol, li { margin-top: 0 ; margin-bottom: 0 }
-->
On a
brightday with clear skies, the perceived edge of a shadow
appearsnear the outer edge of the penumbra. With
increasing haze or whenever the edge of a cloud passes by, the
perceived edge
Hello Bill:
By strange coincidence, I returned home just today after also being
cast away on a tropical island, Kaua'i. I spent the entire week there
studying the sun closely (through the back of my eyelids) and splashing in
the waves, where the surf stole my watch off my arm, leaving me in
I was asked about laser engraving of plastics, for use as dial scales, and
thought it worth forwarding to the list.
It seems that just about any sign, rubber stamp or trophy shop these days
has (or has access to) computerized engraving equipment. Some use
mechanical engraving, and some use
Alexi:
I applied a little Flat-Lander geometry to your question, and came up with
the two following locations:
Latitude 35° 38' 33NLongitude 13° 56' 0E, and
Latitude 36° 9' 35NLongitude 14° 48' 47E.
These each gave a distance of 50km to both of the origins you
Just though I would throw a global wrench in all of your works...
The longest solar day is on or about September 15th (my birthday),
when the day is 24 hours and 21.5 seconds long! The shortest solar day
is December 25, at 24 hours minus 30 seconds.
Enjoy today anyway!
Pete S.
John Pickard
An interesting bar bet might be the question What is the longest day of
the year? In the northern hemisphere, most people would answer June
21st. In the southern hemisphere, the answer might be December
21st. Actually, the correct answer to the question would be September
18 (at least for
My apologies for such late input to this thread, I have been a little behind
in my e-mail! I encountered many of these problems and the same questions
when designing my Analemmic Equatorial sundial
( http://netnow.micron.net/~petes/sundial ). I hope the following
will help.
Luke Coletti wrote:
I have a screensaver installed on my PC that I really like, which I
think many of you might enjoy as well. It is Earth.scr, and may be
downloaded from the site http://www.fourmilab.ch/earthscr/ . The Earth
screen saver displays an image of the Earth as it is currently
illuminated by the
!
Pete S.
fer j. de vries wrote:
Dear Pete Swanstrom,
With much interest I read your article in the Compendium vol.5 number 4,
dec. 1998 concerning your analemmic-equatorial dial.
Few months ago I also have read your Internet site and I already was
familiar with your design.
At that time I
It's been entirely too quiet on this mailing list lately...
A SAILOR WHO SLEPT IN THE SUN,
WOKE TO FIND HIS ZIPPER UNDONE.
HE REMARKED WITH A SMILE,
I'LL BE DARNED, A SUNDIAL,
AND IT'S NOW A QUARTER PAST ONE!
I hope we get some serious correspondence
Pete Swanstrom wrote:
The first factor is the 354.2424 day solar year...
I will have to give up typing late at night, or will at least have to
learn how to proofread better. Obviously, that should have read
The first factor is the 365.2424 day solar year...
Thanks! Pete
, temperature and
humidity layers. I think Boise has too much weather!
Pete Swanstrom.
this September, and would like to bring up my brass sundial, hear some
of the presentations, see some of the other work out there, and
hopefully meet a few of you I have corresponded with. Hope to see you
there! Thanks again,
Pete Swanstrom
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