This discussion has not included noting the capabilities of quadrants. There are several stereographic quadrants that provide the solar azimuth for a date and solar altitude. Among them are Gunter's quadrant (if azimuth curves are include), the Islamic quadrant based on a folded astrolabe and Sutton's quadrant which uses a southern projection. Of the several, Sutton's quadrant is the easiest to use and the most precise for its size.
I am not aware of much in print about Sutton's quadrant other than the chapter in "The Astrolabe". I can easily generate recreations if there is an interest/need.
Best regards,
Jim
James E. Morrison
janus.astrol...@verizon.net
Astrolabe web site at http://astrolabes.org
Astrolabe web site at http://astrolabes.org
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