Clavius, Christoph, Geometria practica

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171141LIBER TERTIVS.11
Vt vmbrarecta H B, in \\ quadrato abſciſſa # ad lat{us} A B, # Ita longitudo vmbræ pro- \\ iectæ A F, # ad F G,
#### Vel
Vt lat{us} A D, # ad vmbram verſam D E, ab- \\ ſciſſam in quadrato # Ita longitudo vmbræ \\ proiectæ A F, # ad F I,
altitudo propoſita F G, vel F I, proueniet nota &
c.
LONGITVDINEM vmbræ ab altitudine, Sole lucente, quando
altitudo eſt cognita, ope quadrati apertam, &
manifeſtam facere.
PROBLEMA XXXV.
103[Figure 103]
1. Hoc etiam problema à ſecundo diuerſum non eſt: ſolum hic pro diſtan-
tia accipimus longitudinem vmbræ, quam altitudo nota, Sole lucente, proii-
cit.
Sit ergo altitudo A F, eiuſque vmbra proiecta F G. Dirigatur quadratum
verſus Solem, vbicunque menſor extra vmbram conſtiterit, &
tranſeunte ra-
dio Solari per pinna cidiorum foramina, obſeruetur vmbra ſiue recta, ſiue ver-
ſa, quam filum perpendiculi, vel dioptra abſcindit.
Ita namque ſe habebit latus
quadrati A B, ad vmbram eius rectam B E, abſciſſam, vt altitudo A F, ad vmbram
proiectam F G.
Item ſic erit vmbra verſa D E, in quadrato ad latus A D, vt al-
titudo A F, ad vmbram proiectam F G.
Dioptra denique, vel filo perpendicu-
li per punctum C, tranſeunte, altitudo A F, longitu dini vmbræ proiectæ F G,
æqualis eſt.
quæ omnia in problemate 2. demonſtrauimus. Quamobrem ſi fiat,
22
Vt lat{us} A B, # ad vmbram rectam abſciſ- \\ ſam B E, # Ita altitudo nota \\ A F, # ad F G:
#### Vel
Vt vmbra verſa D E, abſciſſa \\ in quadrato # ad lat{us} A D, # Ita altitudo nota \\ A F, # ad F G,
exibit nota longitudo vmbræ proiectæ F G, &
c.
DISTANTIAM in Horizonte inter menſorem, & ſignum aliquod
viſum, beneficio ſimpliciſſimi cuiuſdam inſtrumenti comperire.

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