Hi Duane:
Another way to incorporate the equation of time into a sundial is to use the
"analemma" - a graphic representation of the EofT - placed on a pivoting
surface with a gnomon/sight to produce a shadow or solar image on the analemmic
surface - the pivot is scaled relative to a fixed, ma
Open source - Open source-Open source - Open source-Open source -
And if anyone DARE! to reuse the text above...Be Warned!!
Should you be foolish enough to copy and reproduce this text
( [Open source] text 5 times - with a spaced hyphen on every other
one, trailing hyphen, space
Steel frame welded and bolted in 3 sections
(two sides and top) with copper or brass sheeting bolted on. Maybe a
concrete base 3/4 ft high with rebar studs to bolt the thing down to. pre
assemble - mark - disassemble, then ship to site with easy to follow
instructions.
Just my .02
Dave
That is all well and good, but by rotating the Camera Obscura (I prefer the
term pinhole lens) aperture you can hold angular problems to analemmic
degrees, much less problematic when this is the case.
This also gives a handy way to make very small angular measurements more
visible on a scale attac
Hi John (and list)
As you know I have been using this technique
to model my heliochronometers for some time and having looked at the SketchUP
site I would say it is not bad, and for the price phenomenal.
Of course I will be staying with what I have, as I
need the ability to generate CNC t
- Original Message -
From:
John
Carmichael
To: Roger Bailey ; Sundial List
Sent: Saturday, July 08, 2006 9:05
AM
Subject: Re: Door Knocker Gnomon?
Dave Bell just suggested changing the
gnomon to the center finger instead of the index finger for an adde
- Original Message -
From: "Sara Schechner" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>;
Sent: Saturday, February 11, 2006 12:15 PM
Subject: Re: Numb3rs
> I had to laugh when I watched the show last night, too. To a 100th of a
> degree? As if the basketball hoop's pole is not tilted
> I wonder how could I derive some
> implicit or, better, parametric equations for such
> gnomon in order to introduce them in a CNC machine,
> for instance.
>
> Any hint or pointer?
Hi anselmo & all:
Introducing the shapes you want into a CNC is a matter
of producing (in most instances) "G
Hi all:
I have a question for list members. Does anyone know if a Southern
hemisphere heliochronometer has ever been produced? I would think one must
have been, but can find no reference to any on the net.
Perhaps the Pilkington could be made to operate below the equator?
TIA
Dave G.
http:/
- Original Message -
From:
[EMAIL PROTECTED]
To: sundial@rrz.uni-koeln.de
Sent: Friday, November 11, 2005 11:39
AM
Subject: Vertical Bullnose dial
Is there a simple solution to this problem?
Two meeting vertical walls each decline 5
de
- Original Message -
From: "tony moss" <[EMAIL PROTECTED]>
To: "Sundial Mail List"
Sent: Saturday, October 15, 2005 5:42 AM
Subject: The kindest cut...
> Fellow Shadow Watchers,
>The following may not be new or of interest to long
time SML members but there are
- Original Message -
From: "Mac Oglesby" <[EMAIL PROTECTED]>
To: "SUNDIAL"
Sent: Friday, October 14, 2005 3:40 AM
Subject: Images
>
> Hello,
>
> Apropos of our ongoing discussions about shadow-sharpeners and
> pinhole images, take a peek at today's (14 October 2005) Astronomy
> Picture
- Original Message -
From: "Frank Evans" <[EMAIL PROTECTED]>
To: "Sundial"
Sent: Wednesday, October 12, 2005 3:16 AM
Subject: equation of time
> Greetings fellow dialists
>
> In his recent article on the equation of time in BSS Bulletin 17 (iii),
> Chris Daniel writes that the earliest
"Apart from the obvious absurdity of believing that any system will
last 1000 years [though I accept that the Julian calendar had a
good run!] I simply see no need for a change. Those who write
software that implements communications protocols should work
just a little harder."
Hi Frank and All
- Original Message -
From:
Fred Sawyer
To: Aten Heliochronometers ; Sundial
List
Sent: Saturday, September 24, 2005 11:24
AM
Subject: Re: Numb3rs
There was also a Barnaby Jones episode
No doubt, but I could never watch much Barnaby
Jones, I
That is quite interesting Fred:
I think, IIRC, that an old Perry Mason
episode (1960?) had a plot twist that was also based on a photo in which
the shadow played a part in the truth (or untruth) of an alibi due to the time
recorded by a shadow. I think the location and direction of the p
- Original Message -
From: "James E. Morrison" <[EMAIL PROTECTED]>
To:
Sent: Thursday, July 28, 2005 6:42 PM
Subject: [Fwd: Re: New version of software SONNE]
>
> I have more years in the software development business with a really big
company (IBM) than I care to acknowledge.
Thanks
- Original Message -
From: "anselmo" <[EMAIL PROTECTED]>
To:
Sent: Thursday, May 19, 2005 12:16 AM
Subject: Where to buy tiny compasses?
> Dear all,
>
> I know this question is old hat, but I suppose this could yet
> interest many of you.
>
> I need a moderate amount (say 50 or 60)
Hi Dialists:
Does anyone know anything about a sundial
(heliochronometer) designed and built by Charles Avila and a Mr. Evans in
the mid 1990's? I think these were produced in Boston Mass. USA, and were
featured in Sky & Telescope magazine in late 1994. I am very curious
about this desig
Hello group:
I would like to invite anyone interested in
dialing, and especially those interested in heliochronometers, to visit my new
web site http://atensundials.com . It is
mainly about these instruments, and has photos and descriptions of some that I
have designed and built.
Any f
- Original Message -
From: "Claude Hartman" <[EMAIL PROTECTED]>
To:
Sent: Sunday, April 10, 2005 6:45 PM
Subject: Size of Analemmatic
> With all the talk about how big an analemmatic dial should be it struck
> me that it
> could be of NO consequence!
>
> The analemmatic is an azimu
Hello group, I am new here, but have been reading
the posts for a few days.
I have a question for the group, I am designing a
new heliochronometer (afterwards to be referred as a "helio" for brevity) and I
am striving for a bit more accuracy. Roughly, I intend to try and cast a
point of l
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