Primitiae gnomonicae catoptricae, hoc est, Horologiographiae nauae specularis ... (1635)
Kircher, Athanasius, 1602-1680 · Auenione : Ex typographia I. Piot ... · leaf 67
LIBRI I. yr ) tum eft fernper oppofitus efle debet i atque aequa- lem cum incidente radio conflituere angulum) V … -V (patio 2.4. horarum in didta fuperficie laquearis alicuius perfectum conum defcribat ■, quod fi cir- cularis afler horizonti parallelus, in eam altitudine eleuetur yvt diameter bafis afleris diametro coni- D.C. exadle adaequetur ; radius {olis rqflexus vna cum incidente perpetuo limbum circuli…
Sundials
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
![An illustration from Astronomia nova aitiologetos [romanized] sev, Physica coelestis : tradita commentariis de motibvs stellae Martis, ex observationibus G.V. Tychonis Brahe : jussu & sumptibus Rvdolphi II. romanorvm imperatoris &c. : plurium annorum pertinaci studio elaborata Pragae ... (1609)](https://img.insideoutlibrary.com/img/200/ia-astronomianovaai00kepl-300-0.webp)
![An illustration from Sphaerae atque astrorum cœlestium ratio, natura, & motus : ad totius mundi fabricationis cognitione[m] fundamenta (1536)](https://img.insideoutlibrary.com/img/200/ia-sphaeraeatqueast00unkn-290-0.webp)
