Primitiae gnomonicae catoptricae, hoc est, Horologiographiae nauae specularis ... (1635)
Kircher, Athanasius, 1602-1680 · Auenione : Ex typographia I. Piot ... · leaf 179
verfus C. nume- . 1 f rando , a pundo O incipiendo, reprahentant enim hic ODY. arcum diurnum 23, vel nocturnum Y, Sc OCY. diurnum Y Se nocturnum s, vt vides. Pro horis vero intequalibns , feu antiquis , vel pla- netariis , diuidendx funt hngula: portiones paralle- lorum inter communes eorum, atque…
Sundials
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
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