Fabrica et vsvs : instrvmenti ad horologiorvm descriptionem peropportvni : accessit ratio describendarvm horarum a meridie & media nocte exquisitissima, & nunquam ante hac in lucem edita (1586)
Clavius, Christoph, 1538-1612 · Romae : Apud Bartholomaeum Grassium · leaf 56
R0K.0 LOGIO … Cj per D, traie<3:a erit iiiiea inditis, fiueftyli, quemadmodum in Horizontali horologio eadem C D, erat in figura radiorum linea meridiana. Deinde in linea fbyli horologij fumpta reda D I, cequali ipfi B D, fiue fupra lineam cequinodia !em,fiue infra, accipiantur omnia interualla horaria inter…
Sundials
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
