Re: Azimuth Calculation

Tue, 23 Jul 2024 17:45:59 -0700


Hi Brooke.
Yes you are right.
The links you proposed are easier to access.
Thank you.
About the Skylight Compass: It is a very interesting article.Thank you.
Best regards.
Alfonso Pastor-Moreno
galvag...@gmail.com

P.s Keith: Try with these links if they work for you.

On 23 Jul 2024, at 23:57, Brooke Clarke <bro...@pacific.net> wrote:

 Hi Alfonso:

These links may be easier to access:
https://www.academia.edu/44609415/Sun_Compass_The_Theory_behind_the_Sun_Compasses
https://www.academia.edu/85934045/The_Construction_of_the_Roman_Altitude_Cylinder_Sundials_Parts_1_2_3

PS Here is a Skylight Compass that uses the polarization of the sky.
https://prc68.com/I/S5807.shtml#Skylight_Compass
-- 
Have Fun,

Brooke Clarke
https://www.PRC68.com
axioms:
1. The extent to which you can fix or improve something will be limited by how well you understand how it works.
2. Everybody, with no exceptions, holds false beliefs.
-------- Original Message --------
To all the sundialists involved in this thread about Azimuth Calculation.
Hi all.
Regarding the subject about Sun's Altitude vs Sun's Azimuth, some years ago I wrote two papers that could be of your interest. 
They can be downloaded from Academia in the following links.

Sun Compass. The Theory behind the Sun Compasses

https://d1wqtxts1xzle7.cloudfront.net/65073791/Sun_Compass_Theory_APM_v1_3-libre.pdf?1606791440=&response-content-disposition=attachment%3B+filename%3DSun_Compass_The_Theory_behind_the_Sun_Co.pdf&Expires=1721729703&Signature=ZhdMFU6oekFXxpo2t4DrBxbQodbPCbeGW5MBADE7GPLveWD4eTSMcHIgVQ2dzxz0P5544CafvZuF7rpqGs4rYs5IjHI8pu-HHih-uPzjMwiZq8UFqN-u5jNA9iYfVSayCNCwPHBJEj1dFX-dMk2QeNPn2nzogFjiR2USnxhc3PDc9oLkYNZF-mvInQCK7m09~L4Y2tmotJEdScQjF2bhJQJQOKB~sCGWuhppzxWUcphyOTxpP7L1SXUjVYq2E~xDx5BEaOvGCAx2oqcefeqR9m2lLM-utgLYUwKL~X8KsheHDbiYqrYyecCRkrZXHTDTNoCeK7NZ3l9MuWtUSGQhmw__&Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA


Construction of the Roman Altitude Cylinder Sundials by the Analemma of Vitruvius Parts 1,2,3.


About this subject in the NASS "The Compendium" 29(4) December 2022, and 30(1) – March 2023,  Robert L. Kellogg and myself, we wrote ex aequo an article entitled:
PORTABLE CYLINDER SUNDIALS CONSTRUCTION.

In the mentioned articles the subject 'Sun's Azimuth vs Altitude calculation" is treated extensively.
Maybe some of you could be interested in having a look to the articles.
Kind regards.
Alfonso Pastor-Moreno

On 22 Jul 2024, at 21:37, guillemet.herve <guillemet.he...@free.fr> wrote:


HI John,

It seems that the instrument you are looking for is called a shepherd's dial. It is mobile, you set the date, you hold it vertically and orientate the horizontal equivalent gnomon towards the sun and it gives you the time. It is calculated for a specific latitude. 

Best regards Hervé Guillemet 

Envoyé depuis mon appareil Galaxy


-------- Message d'origine --------
De : John Goodman via sundial <sundial@uni-koeln.de>
Date : 22/07/2024 16:14 (GMT+01:00)
À : Fred Sawyer <fwsaw...@gmail.com>
Objet : Re: Azimuth Calculation

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