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How can they even imagine that this claim is true?
r the
quadrants with the proper additions, subtractions, and inversions, I think I
may have a solution that works for me.
Thanks to all the mathematically astute members of this list who've given me
their detailed explanations.
John
> On Jul 22, 2024, at 5:13 AM, Alfonso Pastor-Moren
>
> or
>
> ω = 
>
>
> To force correct quadrant
>
> if γ > 90, use ω =360 − Term 1 – Term 2
>
> if γ < −90, use ω = −Term 1 – Term 2
>
> if γ = 0, use ω = 0
>
>
>
> These rules are for latitudes north of Tropic of Cancer. I&#
to this very question. At
> some point it will appear in an article in The Compendium.
>
> Fred Sawyer
>
>
>
> On Sat, Jul 20, 2024 at 10:02 AM John Goodman via sundial
> mailto:sundial@uni-koeln.de>> wrote:
>> Diese Nachricht wurde eingewickelt um DMARC-
> home.
>
> Steve
>
>
>
> On 2024-07-20 8:50 a.m., Steve Lelievre wrote:
>>
>> On 2024-07-20 7:01 a.m., John Goodman via sundial wrote:
>>> My ultimate objective is to find the sun's hour angle on a given day, in a
>>> given location, when
2024, at 11:50 AM, Steve Lelievre
> wrote:
>
>
> On 2024-07-20 7:01 a.m., John Goodman via sundial wrote:
>> My ultimate objective is to find the sun's hour angle on a given day, in a
>> given location, when it reaches a selected azimuth.
> John, here's
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Thanks for the reference. My ultimate objective is to
on, we can see that h0 takes the same value for
>> positive and negative azimuths which is what we would expect. However, if
>> the absolute value of A exceeds 90 degrees, then h0 and thus x become
>> negative. This is the reason for:
>> If A < 90, h = x + h0
>>
symetry in the trigonometric circle
> : sin (pi - A) = sinA. As an example sin 120° = sin 60° = 0,866... For the
> same sine value, you have 2 angles. This is why you need to determine whether
> Az is > 90° or < 90°
>
> I hope that it answers your point.
> Best regar
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Early in 2015, James Morrison helped me with some for
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It’s hard to conclude that ‘“nothing will change” for
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> Date: Tue, 19 May 2020 14:05:55 +0200
> From: Will
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This story from the Hoover Dam should find interest f
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Hi Kevin,
Your site is an awe-inspiring collection o
, at 11:53, Kevin Karney mailto:kar...@me.com>>
> wrote:
>
>> John
>> Not very beautiful, as you say, by pretty impressive technology - I'll try
>> to get to see it. Berkeley Castle is not too far from my home. I'll post
>> some photos if I get there.
>
The sundial shown at this link looks completely conventional but it was made
out of stainless steel using a 3D printer. Someone at the Renishaw company
should have contacted this list to commission a more interesting design!
http://trends.directindustry.com/project-181814.html
-
Hello Fabio,
This is a beautiful animation and clever mechanical design! I can’t say that I
completely understand either. What software did you use to compose and animate
the gears?
Thank you for sharing your work. It was definitely a worthwhile use of two
week. I wish I could say I’ve accompl
"Six-month solargraphy - showing the sun’s high path in summer to low path in
winter – taken over one of the sunniest cities in Canada."
http://earthsky.org/todays-image/suns-path-over-medicine-hat-alberta-canada
---
https://lists.uni-koeln.de/mailm
Not a sundial, but another tool sensitive to solar movement.
> The first of her kind, Caia illuminates your home with real sunlight. She’s a
> smart robot that finds and redirects natural light for you. Caia remembers
> where to send the sunlight and keeps it there all day as the sun moves. You
On Jan 20, 2017, at 7:40 AM, Frank King wrote:
> If I had been consulted, I would have suggested that the Great Seal should be
> a little smaller so that it will always be wholly illuminated at the crucial
> instant!
That would have been a clever and elegant solution!
---
usual bi-annual sundial
>
> John,
>
> There is also this that describes (a little) the thinking that was behind the
> way they attempted to accommodate the small changes that still occur year to
> year.
>
> http://www.onlineatanthem.com/news/memorial-science
> <http://
Thank you, Frank. You’ve sharpened my vague suspicions with mathematical
clarity.
> On Jan 19, 2017, at 11:33 AM, Frank King wrote:
>
> OK, take a deep breath and see what we are up against...
---
https://lists.uni-koeln.de/mailman/listinfo/sundi
Won’t the factors that necessitate the addition of a leap day prevent this
alignment from happening at exactly 11/11 11:11 every year? From year to year,
that calendar date occurs at a slightly different fraction of the year’s days.
November 11 is the day 316 of 366 in 2016 and 315 of 365 in 201
You can find Tony's BSS photo-etching video on YouTube -
www.youtube.com/watch?v=HkpCCA-hgrc
The same video was posted in two parts back in 2010:
Part 1 - www.youtube.com/watch?v=ML37yRmAsOA
Part 2 - www.youtube.com/watch?v=PAW0q6i7aqg
> On Aug 31, 2016, at 12:34 AM, Wojtek Galinski wrote:
>
> calendar with seasonal markers was much more important than measuring the
> time of day.
>
> Regards,
> Roger Bailey
>
>
> From: John Goodman <mailto:johngood...@mac.com>
> Sent: Sunday, April 24, 2016 8:31 AM
> To: Sundial List <mailto:sundial@uni-koeln
I was recently in northern Argentina at the Tropic of Capricorn. I saw a
structure there that has been described as a sundial but I have trouble
understanding how it could work. I'm attaching a small photo of the gnomon,
which is angled at roughly 23.5 degrees. So far so good.
What confuses me
Excerpts from a report in the New York Times:
Sunlight on Summer Solstice Will Light Up Fulton Center Hub
For nearly three hours on the summer solstice, a structure in the center known
as the Sky Reflector-Net will send rays of light about 40 feet below sidewalk
level to recesses on the lowest
Not exactly a sundial, but demonstrating solar awareness.
“Architects at the firm NBBJ in London decided to see if they could come up
with an entirely shadowless building. They used computer modeling to design a
pair of buildings, one of which works like a gigantic, curved mirror. The glass
sur
I find this website very helpful for visualizing the changes in daylight over
time and latitude.
Daylight Hours Explorer
http://astro.unl.edu/classaction/animations/coordsmotion/daylighthoursexplorer.html
> On Feb 3, 2015, at 3:36 PM, sundial-requ...@uni-koeln.de wrote:
>
> OK, I would also li
work for me. I’m now
trying to understand how the math represents the spatial geometry of the
problem.
The variety of solutions I received are an indication of the broad experience
and wisdom embodied in this group. I'm always grateful for that asset.
> On Jan 31, 2015, at 10:05
Dear dialists,
Does anyone know a formula for calculating the hour angle given the azimuth,
declination, and latitude?
I’d like to know the time of day, throughout the year, when the sun will be
positioned at a particular angle. This will allow me to determine when sunshine
will stream square
For anyone who objects to daylight saving time, this is the video for you. It’s
also funny for everyone else too.
https://www.youtube.com/watch?v=k4EUTMPuvHo
---
https://lists.uni-koeln.de/mailman/listinfo/sundial
A list of star catalogs is available here -
http://www.projectrho.com/public_html/starmaps/catalogues.php
There are many planetarium apps available from the iTunes store. This one is
well-regarded - https://itunes.apple.com/us/app/the-night-sky/id475772902
On May 22, 2014, at 5:39 AM, sundial-
A new solar-powered, self-moving concept car from Ford tracks the sun to
maximize charging power:
> It parks itself under a simple structure, 4 meters by 5 meters (about 13 feet
> by 16 feet), with a plexiglass lens for a roof. The car picks the north-south
> coordinate according to the season
An explanation of celestial mechanics in the popular press:
"The earliest sunset really comes in the first week in December, and the latest
sunrise occurs in early January. Yet December 21 really is the shortest day of
the year. What sort of astronomical hijinks are responsible for this absurd
Hi Donald,
The errors on your site are not very serious. As you may have discovered, going
to http://validator.w3.org/ and typing in www.sundialsforlearning.com will give
you a list of them. Most are simple formatting errors that most browsers ignore
and process with no visible rendering proble
If you collect several references, consider adding sundials as a category to
the newly-forming website smalldemons.com As they describe it:
> Song. Album. Movie. Fashion. Food. Cocktail. Car.
>
> Much of how we come to know and love stories is by the things that help
> define them. Why not l
>From time to time, list subscribers have posted links to low-cost, simple
>sundials. I'm helping a friend find a source for time-related gifts priced at
>less than $25. Can anyone please refer me to sundials that meet those price
>guidelines?
Thanks very much,
John
-
If you're looking for software libraries, I've been happy using these:
> AA+ is a C++ implementation for the algorithms as presented in the book
> "Astronomical Algorithms" by Jean Meeus.
http://www.naughter.com/aa.html
On Aug 24, 2011, at 9:24 AM, David Patte wrote:
> If there is a need for
On Mon, 18 Jul 2011, at 8:54 AM, Mac Oglesby wrote:
> Also, I don't remember seeing any hint about the installation's location.
According to this YouTube post - http://www.youtube.com/watch?v=CvWh2xBbwrE -
the pavilion is located at the Art Center College of Design in Pasadena, CA
See also, pa
A sun-themed essay in the New York Times:
"The word 'solstice' derives from the Latin sol (meaning sun) and statum (stand
still) ... Virtually all cultures have their own way of acknowledging this
moment."
A world-wide survey of customs follows -
http://www.nytimes.com/2010/12/20/opinion/20coh
edom Cottage, Llandogo, Monmouth, NP25 4TP
> Phone 01594 539 595. Mobile 07595 024 960
>
> On 1 Jul 2010, at 18:12, John Goodman wrote:
>
>> Hello all,
>>
>> I usually shudder when I see equations in messages posted to the list, but
>> now I have a problem t
Hello all,
I usually shudder when I see equations in messages posted to the list, but now
I have a problem than needs a mathematical solution.
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 latit
On Jun 13, 2010, at 12:16 PM, Jack Aubert wrote:
> I have been working on photo-engraved brass dials under the generous
> long-distance tutelage of Tony Moss, starting from a video that he presented
> at our most recent NASS conference.
Is this video online anywhere? I'm curious about how the pro
> In China there are 1.2bn people spread over
> 60 degrees of longitude all living by the
> same clock time.
>
> Compared with their fellows in the easternmost
> 15 degrees, the others are effectively living
> with single, double and quadruple summer time.
This is technically true, but in p
Hi Greg,
The PyEphem Python scripts look great! Now that I've figured out how to use
Python, these functions will be very useful.
Thanks for passing on the link,
John
__
A sundial without the sun - www.annosphere.com
On Mar 3, 2010, at 1:56 PM, Greg
Thanks to all of those who have pointed out the variety of existing solar
position calculators. I also now appreciate the level of accuracy that's needed
for astronomical purposes; by comparison, dialists have it easy. Many good
minds have journeyed towards the goal of building a model that fait
Thank you for checking the Python calculations against the results given by
Orologi Solari. There a difference of less than 0.05 percent between the two
calculations. (20.72373 vs. -20.71767, and 39.18438 vs. 39.20351) Is that to be
expected and is it a meaningful level of precision?
On Mar 3,
If anyone needs to make precise solar position calculations, the following
software may be useful. There are a few caveats. The software is not a
stand-alone application, it's a software library. The software library needs to
be used from the command line and it runs using the Python programming
Another video on the topic of mechanical computers:
http://www.ted.com/talks/tom_wujec_demos_the_13th_century_astrolabe.html
> Date: Fri, 18 Dec 2009 15:51:46 -0500
> From: patrick_pow...@compuserve.com
> Content-Type: text/plain; charset="us-ascii"
>
> Frank: An amazing device indeed. Sadly I
Dear dialists,
My knowledge of sundials is very limited compared to almost anyone on this
list. I joined this list to help me understand what I would need to know to
build an indoor sundial.
I did not start out with this plan. An interest in mechanisms led me to build a
set of gears with a rat
Hello all,
I learned something recently about another time-related project that
may be applicable here. A group of people are building something
called the Clock of the Long Now that's expected to run unattended for
10,000 years ( http://longnow.org/projects/clock/ )
The timekeeping part of
e-
> From: sundial-boun...@uni-koeln.de [mailto:sundial-boun...@uni-
> koeln.de] On
> Behalf Of John Goodman
> Sent: Tuesday, September 29, 2009 8:48 AM
> To: sundial@uni-koeln.de
> Subject: Re: Another mechanical sundial
>
> Dear dialists,
>
> While we're stretchi
Dear dialists,
While we're stretching the definition of a sundial, I'll pass on a
link to my version of a mechanical sundial that I call an annosphere.
The annosphere uses a set of gears to create a day-to-year ratio of 1
to 365.2422. A ring, inclined at the angle of the ecliptic, turns once
I copied the JPEGs from the website and posted them online at:
http://files.me.com/johngoodman/9wlbfj
http://files.me.com/johngoodman/mk48mj
http://files.me.com/johngoodman/asj8u2
http://files.me.com/johngoodman/0vbv3l
http://files.me.com/johngoodman/x0hk02
The links will be good for 30 days.
O
On Jan 15, 2009, at 1:58 PM, Lufkin, Bradley (MS wrote:
> Here's a sundial which illustrates these points. It's an Oughtred dial
> set for the Arctic Circle without longitude, EOT, or refraction
> corrections. Note that the Sun is above the horizon for the entire day
> on the 21st of June (but jus
The equation of time is not ignored by the Long Now clock. In one of
their FAQs they state:
> The clock is projected to be accurate to within one day every 20,000
> years, but just in case it isn't, a solar synchronizer will correct
> the time shown on the clockface. A lens on top of the clo
On Apr 13, 2008, at 10:23 AM, Ricardo Cernic wrote:
> Dear Albert,
>
> I've never heard about a program for MAC OS, but considering that
> Stundlin is mainly text oriented you could have the same output with
> almost the same look using a spreadsheet. Have you considered using
> this approac
I found a review of "Geared to the Stars" online, and it looks like a
fantastic reference. While it's out of print, I'm lucky that there's a
nearby library with a copy. I hope to go there soon to take a look.
Thanks for calling this to my attention. Many people have built
amazing astronomica
The drawings are beautiful, and now, thanks to the English
translation, I can actually understand the clock's functions!
Has anyone ever documented the mechanism that controls the
interrelated movements? Having built a (mechanical) timepiece that
incorporates the day-to-year ratio, I'm curio
On Feb 10, 2008, at 6:00 AM, Patrick Powers wrote:
> Indeed, if you want a bit of fun, if you have Google Earth and care
> to type
> in 52 45' 16.28"N, 01 08' 12.33" W then you go directly to the
> second of
> these dials.
Even if you don't have Google Earth you can go to the http://
maps.g
For anyone who's imagination has been piqued (like mine) by this
oblique discussion, you don't have to search out the unabridged OED.
A quick visit to www.dictionary.com will give you the historical
definition of "quaint.'
For anyone who's seen the new film version of "Atonement," you can
On Jul 15, 2007, at 10:43 AM, Brooke Clarke wrote:
> The photoshop print size is based on 72 DPI which at one time was
> the common
> printer resolution. If your DPI setting is not 72 then the actual
> print size
> photoshop displays will be incorrect.
In the spirit of nit picking, I'll poi
ssage -
From: "John Goodman" <[EMAIL PROTECTED]>
To: "Fred Sawyer" <[EMAIL PROTECTED]>
Cc: "Sundial List"
Sent: Friday, October 06, 2006 10:48 PM
Subject: Re: NASS Compendium sample issue
> Thanks for considering a change, Fred. If it's not
Thanks for considering a change, Fred. If it's not too much trouble
for you, it will make it easier for more subscribers.
Best wishes,
John
On Oct 5, 2006, at 11:55 AM, Fred Sawyer wrote:
Yes, perhaps I should have clarified when I said that the
Compendium download was an executable file -
didn't have to jump through hoops to read it.
Thanks for collecting and distributing your research. My complaints
are only intended to encourage you to make the work more broadly
accessible.
Best wishes,
John Goodman
www.annosphere.com
On Oct 4, 2006, at 6:00 AM, [EMAIL PROTECTED] wrote:
Willy Leenders wrote:
Delta Cad is only applicable for Windows. Is there a good alternative
for Macintosh?
Willy LEENDERS
Hasselt Flanders (Belgium)
I can't vouch for any of these products, but you can find
descriptions of 34 different Mac 2D CAD packages at http://www.pure-
mac.com/cad.ht
ay find my dial oversimplified. Whether good
or bad, I'd like to hear what you have to say.
You can see my sundial at http://distractivity.com There is a link
on the site for feedback; you don't need to add traffic to this list
just to reach me.
Thank you for giving this y
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