Re: Solar math

[Yvon Massé]

Dear Dan,

The free open source software TriSph can directly compute this problem. 
You can download it here :

http://gnomonique.fr/trisph/index_en.htm

Yvon


Le 22/03/2018 21:58, sundial-requ...@uni-koeln.de a écrit :

--

Message: 3
Date: Thu, 22 Mar 2018 16:47:08 +0200
From: Dan-George Uza
To: Sundial List
Subject: Solar math
Message-ID:

Content-Type: text/plain; charset="utf-8"

Dear all, given the azimuth and altitude of a point in the sky, what would
be the best way of finding the dates and times during which the Sun reaches
that point? Is there any software for this?

Dan Uza

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Re: Construction-Principle of Capuchin & Universal Capuchin Dials

[Yvon Massé]

Michael,

Some years ago, I spent a lot of time to search a simple geometrical 
justification of these kind of dial. The best way I found is:
- for the Capuchin: from the orthographic projection of the celestial 
sphere on the local meridian (fig. 1)
- for the Universal Capuchin: from the orthographic projection on the 
hour plane of the Sun (fig. 4)


These figures are detailed here:
http://cadrans-solaires.scg.ulaval.ca/v08-08-04/pdf/XIII-4-p10-4.pdf

and the links between the figures and the dial are briefly explained here:
http://gnomonique.fr/divers/anal_3_angc.pdf

Of course, it isn't quite simple but, perhaps, you will find some 
interest in these articles.


Best regards

Yvon


Le 09/05/2017 20:50, sundial-requ...@uni-koeln.de a écrit :


I'm not asking about the *instructions *for constructing Capuchin and
Universal Capuchin dials. I'm asking about the principle, the explanation,
the justification, for their construction.

Some websites have said or implied that it has to do with an orthographic
planisphere. I'm familiar with the use of a universal planisphere, an
azimuthal projection of the celestial sphere in equatorial-aspect.  ...but
it isn't entirely clear how that relates to the Capuchin dials.

I found a handwaving explanation on the web. I've pasted its diagram, and
some of its "explanation", below in this e-mail.

The explanation says that the diagram below, an orthographic projection of
the celestial-sphere, looks just like a Capuchin dial.  And that's supposed
to be an explanation.

So, how does an orthographic projection of the celestial-sphere lead to a
justification and explanation of the construction of a Capuchin or
Universal Capuchin dial?

Can anyone here explain that? If so, the explanation would be appreciated.

Michael Ossipoff


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Two Android apps

[Yvon Massé]

Dear all,

Some months ago, I published 2 Android apps and they seam to be stable 
and appreciated. If you don't know them, you can find and download them 
on Google-Play with the folowing links:

- TpSol: https://play.google.com/store/apps/details?id=fr.ymasse.descad
It is a free app that give the solar time and some solar values for 
gnomonists. A sundial is drawn showing the shadow at the curent time.

- DesCad : https://play.google.com/store/apps/details?id=fr.ymasse.tpsol
It is a cheap (around 2 $) sundial simulator that allows you to draw and 
investigate all the kinds of plane sundial. Some brief instructions of 
use can be found here:

http://ymasse.pagesperso-orange.fr/descad/index_en.htm

Have a good use! Best regards

Yvon Massé
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Re: sundial Digest, Vol 110, Issue 1

[Yvon Massé]

Hello John,

Although it is not a formula, you can use the swiss knife software 
TriSph to obtain the hour angle (and also the legal hour) with the 
configuration Position triangle. You can download TriSph here:

http://yvon.masse.perso.sfr.fr/trisph/index_en.htm

Best - Yvon


Le 01/02/2015 12:00, sundial-requ...@uni-koeln.de a écrit :

Message: 1
Date: Sat, 31 Jan 2015 10:05:46 -0500
From: John Goodmanjohngood...@mac.com
To: Sundial Listsundial@uni-koeln.de
Subject: A question for the mathematically inclined
Message-ID:37cd8a78-c1f4-470f-9292-a709038b9...@mac.com
Content-Type: text/plain; charset=utf-8

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 squarely through a window on any (sunny) day.

I?ve seen several formulae for calculating azimuth. I suspect that one of them 
could be rewritten to solve for the hour angle given the azimuth instead of the 
finding the azimuth using the hour angle (plus the declination and latitude). 
Unfortunately, I don?t have the math skills for this conversion.

Thanks for any suggestions.

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New Calcad

[Yvon Massé]

Dear dialists,

I'm happy to inform you that a new version of the freeware Calcad is now 
available at:

http://yvon.masse.perso.sfr.fr/calcad/index_enu.htm

This new version runs on Windows, GNU/Linux and Mac OS X.

Remember that Calcad is an easy way to draw sundials without knowing 
declination, inclination and even the geographical coordinates!...


Happy dialing

Yvon Massé
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Calcad V3juin12: put a sundial on your desktop

[Yvon Massé]

Dear all,

I am pleased to inform you about a new functionality in the new version 
of Calcad. It allows you, as the Windows clock, to put on the computer 
desktop a little sundial of which shadow moves along the day to give the 
time.


I hope you will appreciate this feature. You can download the new 
version of Calcad at:

http://yvon.masse.perso.sfr.fr/calcad/
or on the main websites of freeware.

Best wishes

Yvon Massé

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New version of Calcad

[Yvon Massé]

Hello all,

I am pleased to inform you that a new version of Calcad now is available at:
http://pagesperso-orange.fr/ymasse/calcad/index_enu.htm

Thanks to M. Brown, the manual is now corrected and more educational.
This version should also satisfy fanatics of accuracy.
Have a good use and nice sundials !...

Yvon Massé

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Re: Denis Schneider

[Yvon Massé]

Hello John,

Here is his email address: schneiderde...@wanadoo.fr

Best receipt

Yvon Massé


- Message d'origine -
De : JOHN DAVIS john.davi...@btopenworld.com
À : sund...@rrz.uni-koeln.de
Envoyé : mercredi 11 août 2010 10:57
Objet : Denis Schneider


Dear Colleagues,

I am trying to make contact with the French diallist Denis Schneider and the
email address I have been given doesn't work. Does anyone have an up-to-date
address, please?

Regards,

John
---

Dr J Davis
Flowton Dials






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Fw: Sundial software

[Yvon Massé]

Dear all,

Thank you for the welcome you made to Calcad.
The version is now fixed, you can find it at:
pagesperso-orange.fr/ymasse/calcad/index_enu.htm
I corrected some language mistakes but, please, excuse me for all those I
have left.

Nice sundials!

Yvon


- Message d'origine -
De : Yvon Massé ymas...@wanadoo.fr
À : sundial@uni-koeln.de
Envoyé : samedi 27 mars 2010 20:22
Objet : Sundial software


 Dear all,

 I am pleased to inform you that the sundial software I wrote, Calcad, is
now
 available in English language.

 Calcad is a new approach in the practical design of sundial for no
 specialist because the usual parameters are not used. Other originality,
the
 first stage of the method is the drawing of the outline that can be drawn
 crooked...

 All the plane sundials are concerned without difference in the
instructions
 for use, it is just needed to measure two shadow points. To summarize:
 Calcad allows you to create 80 % of the sundials with only 20 % of
gnomonic
 knowledge.

 Calcad is supplied with complete help and user's manual. You will find a
 preliminary version (1823 Ko) at:
 http://pagesperso-orange.fr/ymasse/divers/install_calcad_vxxmars10.exe

 I will be pleased to receive your comments and remarks. I will appreciate
 particularly if someone would accept to correct the language mistakes I
 made. This will give a nice tool for beginners in gnomonic.

 Yvon Massé




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Re: Digital Gnomonic Links: updates n° 6

[Yvon Massé]

Dear Nicola,

Many thanks for your wonderful Digital Gnomonic Links project I discover
following your message. It is a very great idea to publish these links that
are, for me, a major interest of the web.

Some months ago, I collected some links of this type.
You can find them at (with a little bit of advertising):
pagesperso-orange.fr/ymasse/analemme/liens.htm
Perhaps one or more links might complete your very full list.

Many thanks once more

Yvon


- Message d'origine -
De : nicolasever...@libero.it
À : sundial list sund...@rrz.uni-koeln.de
Envoyé : samedi 10 avril 2010 16:17
Objet : Digital Gnomonic Links: updates n° 6



Dear Friends,

the updates n° 06 of the Digital Gnomonic LInks project, is ready on my web
site
http://www.nicolaseverino.it
please visit the web site and enjoy the news.

In this update, several nice things:
-some page from ancient manuscripts
-an rare description of a medieval (canonical) sundial from a manuscript;
- 5 new little books of Georg Brentel;
- Fuligatti's book and Oddi Mutio version book from Google;
- a unknowed german gnomonic books published on 1803...
and many other things.
Best wishes, Nicola


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Sundial software

[Yvon Massé]

Dear all,

I am pleased to inform you that the sundial software I wrote, Calcad, is now
available in English language.

Calcad is a new approach in the practical design of sundial for no
specialist because the usual parameters are not used. Other originality, the
first stage of the method is the drawing of the outline that can be drawn
crooked...

All the plane sundials are concerned without difference in the instructions
for use, it is just needed to measure two shadow points. To summarize:
Calcad allows you to create 80 % of the sundials with only 20 % of gnomonic
knowledge.

Calcad is supplied with complete help and user's manual. You will find a
preliminary version (1823 Ko) at:
http://pagesperso-orange.fr/ymasse/divers/install_calcad_vxxmars10.exe

I will be pleased to receive your comments and remarks. I will appreciate
particularly if someone would accept to correct the language mistakes I
made. This will give a nice tool for beginners in gnomonic.

Yvon Massé



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Re: Sundial software

[Yvon Massé]

Hi Roderick,

You are right, it is the length of the side for a square dial. This label
has remained in French by error.

Yvon

- Message d'origine -
De : R Wall maill...@virginbroadband.com.au
À : Yvon Massé ymas...@wanadoo.fr; sundial@uni-koeln.de
Envoyé : samedi 27 mars 2010 22:21
Objet : Re: Sundial software

 Hi Yvon,

 The 1st data entry in the input window is not in English, I did select
 English.   Think it is length of dial sides, am I correct?

 Roderick Wall.






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Re: Sundial software

[Yvon Massé]

Hi Tom,

If you want to compute a sundial without to take measurements, just to
understand the functioning of the software, you can use the simulation that
will calculate the measurements.

Yvon

- Message d'origine -
De : Tom Laidlaw tomlaid...@comcast.net
À : 'Yvon Massé' ymas...@wanadoo.fr
Envoyé : samedi 27 mars 2010 21:01
Objet : RE: Sundial software

Okay, I actually read the instructions and I find I have to almost build a
sundial and take a bunch of measurements, before I can calculate the lines.
How is this simpler?



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