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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mus, vt etiam Ioannes Baptiſta Benedictus facit in libro de gnomonum, vmbrarum{q́ue} ſolarium vſu, hoc
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na qua atte per
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Analemma in-
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Menia@@r.</
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modo. </
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">Inuenta, vt prius, per vmbram recta A B, communi ſectione plani Horizonti æquidiſtantis, & </
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Verticalis circuli tempore obſeruationis per Solis centrum tranſeuntis; </
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<
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xml:space
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tudine Solis, loco Astrolabij deſcribemus Analemma, in quo Meridianus ſit F G H I; </
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Meridiani communis ſectio G I; </
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">eiuſdem Meridiani communis ſectio F H;
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illo die, quo fit obſeruatio, recta N O; </
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">quæ quidem beneficio declinationis Solis ducetur, quemadmodum
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propoſ. </
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que ad Q, ducemus rectam P Q, quæ ex ſcholio propoſ. </
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adeo communis ſectio Meridiani & </
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<
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calem lineam F H, in R, & </
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P Q, ſemicirculo P T Q, ducemus ex S, ad P Q, perpendicularem S T, vſque ad circunferentiam ſe-
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micirculi P T Q, & </
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tio fiat ante meridiem, conſtituemus in centro C, (ex quo vt cunque aſſumpto in linea vmbræ A B, circu-
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lum cuiuſcunque magnitudinis deſcribimus,) angulum A C D, angulo acuto T R Q, æqualem, ab ortu
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verſus auſtrum, id eſt, à puncto A, verſus punctum D, vt in figura A, cernitur. </
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poſt meridiem, eidem angulo faciemus æqualem A C D, ab occaſu verſus auſtrum, hoc est, à puncto A,
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verſus punctum D, vt in figura B, apparet. </
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ante meridiem, ſiue poſt, ducemus ad A B, per C, perpendicularem D E, vt perſpicuum eſt in figura C.
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T R P, ęqualem A C E, ab ortu verſus boream, id est, à puncto A, verſus punctum E, vt videre eſt
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in figura D. </
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occaſu verſus boream, hoc eſt, à puncto A, verſus E, vt exfigura E, manifeſtum est. </
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D E, erit linea meridiana. </
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& </
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dicularis, at que adeo, per definitionem 3. </
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diuidunt diametri dictorum parallelorum. </
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ctio erit parallelorum dictorum, ac proinde tempore obſeruationis centrum Solis in puncto T, erit, ſi
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parallelus Horizontis P T Q, vna cum Meridiano Analemmatis propriam poſitionem habeat. </
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