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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LIBER SECVNDVS.
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in H, & </
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<
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<
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<
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xml:space
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horologij Horizonti æquidiſtans; </
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<
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<
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xml:space
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">Verticalis ad Horizontem rectus ſit, erit
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ad eundem communis eorum ſectio A D, perpendicularis, atque adeo & </
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<
s
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xml:space
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xml:space
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H I, ductum Horizonti parallelum, ex iis, quæ ad pro-
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poſ. </
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<
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<
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<
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xml:space
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laris erit. </
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<
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xml:space
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">Erit ergo H I, in plano horologij linea me-
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ridiana, ſiue horæ 12. </
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<
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xml:space
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">vtpote communis ſectio Meri-
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diani, & </
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<
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<
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xml:space
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">Eſt enim recta H I, in plano
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rectarum H D, I D, hoc eſt, in plano Meridiani; </
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xml:space
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">D G,
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xml:space
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">2. vndec.</
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gnomon erit, ſiue ſtylus ad planum horologij rectus,
<
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atque adeò & </
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<
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">ad H I, lineam meridianam, per defini-
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tionem 3. </
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<
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<
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xml:space
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">Euclidis, perpendicularis, cuius ver-
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tex D, idem eſt, quod centrum mundi, per propoſ. </
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</
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<
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<
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xml:space
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">Locus ſtyli punctum G, in linea meri-
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diana diſtans à puncto H, in quo axis mundi plano
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horologij occurrit, & </
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<
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xml:space
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">quod centrum dicitur horolo-
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gij, interuallo G H, vel à puncto I, in quo planũ Aequa
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toris lineam meridianam ſecat interuallo G I. </
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<
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xml:space
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">Quæ omnia perſpicua ſunt & </
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<
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xml:space
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">manifeſta, ſi Meridia
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nus in proprio ſitu intelligatur eſſe poſitus, vt nimirum punctum E, ad polum arcticum ſpectet, & </
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<
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xml:space
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matis quid di-
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catur.</
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F, vergat in auſtrum. </
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<
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xml:space
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">Hanc autem figuram appellabimus doctrinæ cauſa portionem Analemma-
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tis, cum verè pars ſit Analemmatis propoſ. </
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<
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<
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munes ſectiones Meridiani, & </
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</
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<
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">IAM vero beneficio trianguli D H I, conſtruemus horologium Aſtronomicum horizontale,
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">Horizontalis
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horologij Aſtro
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nomici deſcri-
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ptio.</
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hoc modo. </
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<
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xml:space
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">In lineam rectam H E, ductam vtcunque pro linea meridiana in plano horologij,
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transferatur H I, linea meridiana portionis Analemmatis, & </
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<
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">abſcindatur I E, ex recta H E, rectæ
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<
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DI, in eadem portione Analemmatis æqualis. </
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<
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">Deinde per I, in plano horologij educatur ad H E,
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perpendicularis F k: </
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<
s
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xml:space
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">Et ex E, deſcribatur circulus ad quodcunque interuallum, quo diuiſo in 24.
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</
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<
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xml:space
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">partes æquales, initio facto à linea meridiana H E, producta, ducantur per puncta diuiſionum, & </
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<
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centrum E, rectæ occultę ſecantes rectam F K, in punctis, per quæ & </
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<
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xml:space
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">punctum H, emiſſæ lineę re-
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ctę dabunt lineas horarias à meridie, vel media nocte in plano, quod Horizonti æquidiſtat; </
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<
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H E, det horam duodecimam meridiei, & </
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<
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xml:space
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">lineę nobis conuerſis ad horologium poſitæ ad ſini-
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<
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xlink:label
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xml:space
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in horologio
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horizontali.</
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ſtram (Appello autem ſiniſtram partem, in qua punctum F, dextram vero, in qua punctum k)
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oſtendant horas à meridie, & </
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<
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">lineę ad dextram poſitæ horas ante meridiem, vel poſt mediam no-
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ctem, vt numeri ipſi indicant. </
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<
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xml:space
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">Pro hora verò ſexta eſt ducenda per H, linea C L, ad H E, perpen-
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dicularis, vel æquidiſtans ipſi F K, monſtrabitq́; </
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<
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xml:space
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<
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ſextam à media nocte.</
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