Athanasii Kircheri, Ars Magna Lvcis Et Vmbrae

Liber Nonus, Cosmometria Gnomonica
Pars Secunda
Problema XIII, Paradigma VI
Eclipsis Solis totalis, Apodixis
p 747

Sol ex apogæo ad perigeum tendente,
umbra terræ continuo decrescit, & contra.

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