Primitiae gnomonicae catoptricae, hoc est, Horologiographiae nauae specularis ... (1635)
Kircher, Athanasius, 1602-1680 · Auenione : Ex typographia I. Piot ... · leaf 227
r parallelum horizonti , ea tamen ratione vt & centrum eius centro fpeculi perfecte, & dijmcter horizontalis 9o. grad. lincte meridiante exadte relpondeant lemicir- culo mobili CSN. verticalem mobilem referente, & inftrumentum habebit litum ad Azimuth & Al- micantarath inferibendos idoneum, polito…
Sundials
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
![An illustration from Gnomonice Andreae Schoneri Noribergensis, hoc est, De descriptionibvs horologiorvm sciotericorvm omnis generis, proiectionibus circulorum sphaericorum ad superficies, cum planas, tum conuexas concauasq[ue], sphaericas, cylindricas, ac conicas, item delineationibus quadrantum, annulorum, &c. libri tres (1562)](https://img.insideoutlibrary.com/img/200/ia-gri_33125009484227-185-0.webp)
