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. https://d1wqtxts1xzle7.cloudfront.net/90499756/Roman_Portable_Cylinder_Sundials_Construction_APM_Part_1_2_3-libre.pdf?1662003085=&response-content-disposition=attachment%3B+filename%3DConstruction_of_the_Roman_Altitude_Cylin.pdf&Expires=1721729833&Signature=LQuNqDY0cwMDWa1Y2aoN3ZpZgBIUHOdmGLGMvrRRYPEgoDcWN~bgiu7-ezw0ytBpC6RD0F~KLgXG9xF20nGz~NJl8WGGu---BFpi0141jPDFujWK2ppYJy6gAh-x0iwW0EtbEmiuSrCARU795xcZdVPvIvPl4YpknE-d8qyt8U6G~Mhm4j4h~mW-hTMocoOZurRXl~Qx0InCDd299OrKsFibLr6wBQXSfTK7k6b8Wh1msBMMEhWDF4IvjW9bKcZsJjG--NbViC95fdTftfHAihD3OKrTAeYcRYcOLjbRm7TxIMRsuv0ibbKAQXwITERssz3EKASlmRUGMOeXWwdtMw__&Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA 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 galvag...@gmail.com > 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 > > Diese Nachricht wurde eingewickelt um DMARC-kompatibel zu sein. Die > eigentliche Nachricht steht dadurch in einem Anhang. > > This message was wrapped to be DMARC compliant. The actual message > text is therefore in an > attachment.--------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial >
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