Primitiæ Gnomonicæ Catoptricæ Hoc Est Horologiographiæ Novæ Specvlaris, Avthore, Athanasio Kircher Bvchonio
Avenione, Ex Typographia Piot, 1635
Liber I, Theorema XXI, p77, Parabole, Hyperbole, Ellipsis
Athanasius Kircher
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