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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adem parte illud acceptum ſit) constituatur ad rectam A B, in puncto G, angulus altitudinis poll
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E G C, ſurſum, aut deorſum verſus, prout planum à meridie, vel à borea declinat; </
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rectam C D, in C. </
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">Abſciſſa quoque ex E F, recta E F, ipſi E G, æquali, ducatur ex F, ad A B, perpen-
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dicularis F H. </
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<
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xml:space
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">Sed quoniam propter anguſtiam ſpatij inter rectas A B, E F, interiecti (vt euenire ſo-
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let, cum valde magna eſt declinatio propoſita) non facile abſque errore ex puncto F, ad rectam A B,
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duci poteſt perpendicularis, instituere poſſumus eandem hanc conſtructionem commodius in hanc formã.
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</
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<
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xml:space
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">Sumpto in recta A B, verſus eam partem, in quam ducta eſt recta E F, puncto quolibet H, ducatur ex
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eo ad A B, perpendicularis H F, ſecans E F, in F. </
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<
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xml:space
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">Nam ſi ipſi E F, abſcindamus æqualem rectam E G,
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& </
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<
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">in G, ad rectam E G, angulum E G C, conſtituamus altitudinis poli, reperiemus punctum C, idem
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quod prius, ſed certius aliquanto; </
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<
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xml:space
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">eo quòd facilius ſit ex accepto puncto H, in linea A B, ad eandem du-
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cere perpendicularem ſine errore, quàm ex puncto F, ipſi rectę A B, viciniſſimo.</
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">H, recta C H, ea{q́ue} quantumlibet producta, ducatur ad eam per H,
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perpendicularis H I, in qua ſi abſcindatur H I, ipſi H F, ęqualis, recta{q́ue} C I, ducatur; </
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<
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F N, ad E F, perpendiculari ſecante A B, rectam in N, puncto, quod cum C, recta linea C N, iunga-
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tur; </
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<
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declinationis; </
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<
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6. </
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H K, erit hæc, ex demonſtratis quoque, communis ſectio Aequatoris, & </
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<
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ductum ad planum horologii rectum eſt, inſtar Meridiani cuiuſdam proprii ipſius plani horologii. </
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ſi in linea ſtyli C H, acciperetur recta H L, ipſi H K, ęqualis, & </
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<
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">ex L, deſcriberetur circulus, conſtrue
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retur horologium declinans, cuius omnes lineę horarię in C, coirent, proinde vt in priori deſcriptione
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huius propoſ. </
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dens ad angulos rectos in punctum M, nimis breuis eſt, præſertim quando recta E F, parum à recta A B,
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diſtat, (diſtabit autem eò min{us}, quò maior fuerit declinatio plani à Verticali, vt dictum eſt) idcirco
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progrediendum nobis eſt, atque docendum, qua ratione maius horologium deſcribere poſſimus, quod </
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