Clavius, Christoph, Gnomonices libri octo, in quibus non solum horologiorum solariu[m], sed aliarum quo[quam] rerum, quae ex gnomonis umbra cognosci possunt, descriptiones geometricè demonstrantur

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637621LIBER SEPTIMVS. Supputato quoque in eodem arcu ſurſum verſus complemento inclinationis, ducatur ex β, per fi-
nem
ſupputationis recta (quę perpendicularis erit ad β D,) ſecans C D, in C, puncto, per quod
recta
C E, ducta ad C D, perpendicularis erit linea horizontalis.
11Horizontalis li-
nea
.
DEINDE in recta C D,
ſumpta
recta C F, ſurſum, aut
deorſum
verſus, æquali ipſi
405[Figure 405] C β, deſcribatur ex F, verſus
C
E, arcus circuli, in quo nu-
merata
à recta C D, declina-
tione
plani à Verticali circu-
2210 lo, (quam in prima figura po-
nimus
eſſe à mer.
in ortum
gr
.
40. In ſecunda à mer. in
occaſum
grad.
20. In tertia à
mer
.
in ortum gr. 45. In quar-
ta
à Sept.
in occaſum gr. 20.
In quinta à Sept. in ortum gr.
60
.
& in ſexta à Sept. in ortũ
gr
.
30.) ad dexteram quidẽ,
ſi
planum à meridie in ortum
3320 deflectit, vt in figura 1.
& 3.
vel à Septentr. in occaſum, vt
in
quarta figura, ad ſiniſtram
autem
, ſi planum declinat à
meridie
in occaſum, vt in ſe-
cunda
figura, vel à Septent.
in
ortum
, vt in 5.
& 6. figura, du-
catur
ex F, per finem numera-
tionis
recta ſecans horizonta-
lem
lineam C E, in E.
Nam
4430 recta D E, per D, &
E, in vtrã-
que
partem eiecta dabit lineã
55Linea meridia-
@a
.
meridianam, ſeu horam 12.
406[Figure 406]6640407[Figure 407]7750 à mer. vel med. noc Supputato quoque in eodem arcu à recta C D, in contrariam partem comple
mento
declinationis, ducatur ex F, per finẽ ſupputationis recta (quæ ad F E, perpendicularis

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