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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429413LIBER TERTIVS.
PROBLEMA 47. PROPOSITIO 47.
HOROLOGIVM Babylonicum, quod & à Verticali declinat,
&
ad Horizontem eſt inclinatum, conſtruere.
PRORSVS ijſdem uijs horologium Babylonicum in plano propoſito conficiemus, quibus
11Compoſitio ho
rologii Babylo
nici declinan-
tis ſimul & in-
clinati.
Italicum deſcripſimus, vt liquido ex figura præcedentis propoſ.
apparet; Vbi cõtinentur & horæ
à mer.
vel med. nocte, & tam ab ortu, quàm ab occaſu, quemadmodum in ſuperioribus horolo-
giis.
Sed in primo modo diuiſio circuli a M b N, inchoanda eſt à punctis orientalibus a, & d.
Horologium ergo Babylonicum, quod & à Verticali declinat, & ad Horizontem eſt inclinatum,
2210 conſtruximus.
Quod faciendum erat.
PROBLEMA 48. PROPOSITIO 48.
HOROLOGIVM Antiquum à Verticali declinans ſimul &
inclinatum ad Horizontem conficere.
HOC etiam horologium conſtruemus in plano declinante à Verticali circulo, & ad Horizon-
33Antiqui horo-
logii declinan-
tis fimul & in-
clinati delinea
@o.
tem inclinato eiſdem rationibus, quibus in alijs planis uſi ſumus, vt ipſa figura indicat, in qua
4420283[Figure 283]553066407750 arcum diurnum horarum 18.
delineauimus, qui in portione horologij nocturna in arcũ noctur-
num horarum 6.
commutatur. Quamobrem horologium Antiquum à Verticali declinans ſimul
&
inclinatum ad Horizontem confecimus. Quod faciendum erat.
FINIS TERTII LIBRI.

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