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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GNOMONICES
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<
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">ITAQVE in horologii plano ducta recta A B, quæ in plano ſtabili ac firmo ſit æquidiſtans
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logii declinan-
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tis à mer. in or.
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gr. 45. & ad Ho
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rizontrm in@li-
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nati gr. 51. M.
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51.ex tabulis.</
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Horizonti, deſcribatur ex C,loco ſtyli aſſumpto circulus cuiuſuis magnitudinis A D B E, in quo
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diameter D E, rectam A B,ſecetad rectos angulos, quæ communis ſectio erit plani horologii, & </
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maximi circuli inclinationem ad Horizontem metientis. </
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<
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">arcu circuli maximi, cui horologium æquidiſtat, inter circulum maximum, qui inclinationem
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metitur, & </
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<
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">Meridianum proprium horologii interiecto, quem in propoſito exemplo reperimus
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grad-31. </
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admodum in in horologio declinante à mer. </
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<
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20. </
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<
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">in ortum, vt illud. </
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cta enim ducta F C G, erit linea ſtyli, ſeu communis ſectio horologii, & </
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Linea ęquino-
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noctialis.</
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ni ipſius. </
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">Recta autem K L, ſecans hanc ad angulos rectos erit linea æquinoctialis, hoc
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eſt, communis ſectio plani horologii, atque Aequatoris, à qua latitudines vmbrarum ſuppu-
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tandæ ſunt.</
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<
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longitudinibus, vt in Meridiano horologio, atque polari; </
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<
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</
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nea ducenda eſt per punctum H, vbi hora 6. </
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<
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<
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">ęquinoctialem lineam ſecat, ip-
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@al@s.</
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ſi A B, parallela, vel ad D E, perpendicularis. </
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vmbram P.</
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<
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">quæ inclinationi planiad Horizontem reſpondet, vſque ad I, ducenda erit
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horizontalis linea per I, &</
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complementi inclinationis C M I, ſecabitur rurſus recta D E, in I, puncto, per quod linea ho-
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tizontalis ducitur, &</
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<
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<
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ex parte auſtrali inclinato grad. </
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<
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</
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<
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">In quibus latitudines vmbrarum inferiores ſunt illę, quę citra Verticalem pro-
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prium horologii exiſtunt verſus æquinoctialem lineam, ſuperiores autem illę, quæ vltra eundem
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Verticalem verſus centrum horologii reperiuntur.</
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