A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Örjan Sandström
Date: 2017 Dec 1, 06:34 -0800
573/10 is another ratio (57.295779513082....) 573mm long string 10mm=1°
works for any unit. But metric is simplest and 5mm square or for tech drawing 1mm is common linespacing on paper.
trisectipn and quintsection are pains though, bane of instrumentmakers throuh ages