Full text: 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

GNOMONICES occ. Pari ratione pro hora 13. ab occ. ducta eſt hora 13. ab or. per horam 6. à mer. in arcu diurno
horarum 14. & per horam 7. à mer. in arcu nocturno horarum 12. Item pro hora 14. ab occ. quæ
vnicum punctum habet, nempe horam 9. à med. noc. in arcu diurno horarum 14. accepimus ho-
tam 14. abor. quæ ducenda eſt per horam 7. à mer. in arcu nocturno horarum 10. Recta enim
ducta per hæc duo puncta, nimirum per horam 9. à med. noc. & per horam 7. à mer. dabit in ar-
cu diurno horarum 14. horam 14. ab occ. in arcu vero nocturno horarum 10. horam 10. ab or. Denique pro hora 1. ab or. in horologio Inferiori ducta eſt hora 1. ab occ. in horologio nocturno
per horam 7. à mer. in arcu nocturno horarum 12. & per horam 8. à mer. in arcu nocturno hora-
rum 10. nec non per horam ♉. à mer. in arcu nocturno horarum 14. Hæc enim in inferiori horo-
logio dat horam 1. ab or. vt oſtendimus in ſcholio propoſ. 23. lib. 2.

513.1.

Alia deſcriptio
horologii Itali-
ci, & Babylonſ-
ci ab Horizonte
declinantis, ex
arcubus d@ut-
nis, nocturnis.
0630-01
10
20
30
40

HORAE autem productæ vltra lineam horizontalem dant in inferiori quoque horologio
horas ab or. & occ. vt in Verticali horologio explicauimus.

50

ANTIQVVM horologium conſtruitur, vt declinans à Verticali. Nam v. g. ex f, puncto
horę 4. inęqualis tropici ♋, ducta recta per L, ſecat æquinoctialem lineam in g, & recta C g, tro-
picum ♋, ſecat in h, puncto horæ 4. inæqualis, & ſic de cæteris. Pro hora autem 1. in horologio
inferiori duximus ex in, puncto horæ 1. nocturnæ tropici ♑, per L, rectam, quæ lineam ęquino-
ctialem ſecat in n. Recta enim C n, ſecat tropicum ♑, in p, puncto horæ 1. inæqualis nocturnæ. Quapropter recta ex p, per horam 7. à mer. in arcu nocturno horarum 12. ducta dabit horam 1. nocturnam inęqualem in portione horologii nocturna: hęc autem in horologio inferiori erit
hora 1. inæqualis diurna, & c.

513.1.

Conſtructio ho
rolegii Antiqui
ab Horizonte
decliuantis.
Deſcriptio eiuſ-
dem horologii
An@qui ab Ho
rizonte decli-
nantis, ex arcu
diutno hora-
rum 18.

SECVNDVM autem poſteriorem rationem notauimus in horis à media nocte 9. 10 {1/2}. 12. & in horis à meridie 1 {1/2}. 3. 4 {1/2}. 6. 7 {1/2}. 9. puncta arcus diurni horarum 18. per quæ ducendæ
ſunt horæ inæquales, vt ex tabulis ſcholii propoſ. 33. lib. 1. manifeſtum eſt.

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