Sit in utraque Fig. Centrum Mundi A; verticalis Solis ex centro eodem descriptus B H C E; Horizon B C; planum Horizonti parallelum D E. Erigatur in I.ma figura supra hoc planum stylus F A ad angulos rectos. Dum Sol in H existens illuminat stylum A F, radius apicem A styli radens terminatur in G, efficitque stylus umbram F G. Hanc vocamus umbram rectam.
Erigatur iterum in 2da Fig. supra planum Horizontale D E, planum alius F G ad angulos rectos, eique infigatur ad angulos item rectos stylus G A. Dum Sol in H existens illuminat stylum G A, radius apicem A styli radens terminatur in I, efficitque stylus umbram G I. Hanc umbram versam vocamus.
Recta porro dicitur prior umbra, versa vero posterior, quia illa projicitur a corpore ad Horizontem recto, seu ad angulos rectos erecto; haec vero a corpore non recto ad Horizontem, sed verso penitus, seu invreso, hoc est, ad eundem parallelo.
Page:Organum mathematicum libris IX. explicatum (1668).djvu/241
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