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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tem recti non vergunt directò ad A, punctum meridiei, aut ad C, punctum ſeptentrionis, ſed ab utroque
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declinant verſus D, punctum occaſus, aut verſus B, punctum ortus, delineabuntur quidem in eorum fa-
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cieb{us}, quæ ſpectant ad puncta inter A, & </
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<
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">D, locata, horologia declinantia à meridie, hoc eſt, à puncto
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A, meridiei in occaſum, in faciebus verò oppoſitis ad puncta inter C, & </
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">B, conuerſis, horologia à ſepten
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trione, id eſt, à puncto C, ſeptentrionis in ortum declinantia.</
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">QVOD ſi ſupra rectas I K, L M, conſtruantur plana verſus ortum B, vel occaſum D, ad Horizon-
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tem inclinata, deſcribentur in eorum faciebus ſuperioribus horologia ſuperiora declinantia ab Horizon-
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te: </
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tem plana verſ{us} A, meridiem, vel verſus C, ſeptentrionem, appellabuntur horologia in eorum faciebus
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ſuperiorib{us} delineata, ſuperior a ad Horizont em inclinata: </
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<
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ſcripta. </
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">ſupra rect{as} E I, H M, F L, G K, inclinata ſint plana ad Horizontem quomodocunq;
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</
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<
s
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">deſcribentur in eorum facieb{us} ſuperiorib{us} horologia ſuperior a declinantia ſimul, & </
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riorib{us} autem facieb{us} inferiora. </
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">Ex quibus facile colligitur, infinita propemodum eſſe poſſe genera horo
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logiorum declinantium à Verticali, declinantium ab Horizonte, inclinatorum ad Horizontem, at q; </
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clinantium ſimul & </
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">inclinatorum, propterea quod vna ſuperficies plus, aut minus in infinitum deflectere
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poteſt à Verticali, aut Horizonte, & </
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<
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xml:space
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">Hoc igitur modo Sciotherica horologia
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distribui ſolent, habita ratione ſitus planorum, in quibus depinguntur.</
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<
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">CAETERVM omnia hæc horologia, quæ recenſuimus, diximus æquidiſtare circulis illis maximis,
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">Quare horo
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logia plana di-
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cantur æqui@i-
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ſtare circulis
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maximis, a qui-
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bus nomen ſu-
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munt.</
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à quibus nomina trahunt, quoniam vertex ſtyli ad horologij planum rectus collocari intelligitur in centro
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mundi, at q; </
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">adeò in communi centro illorum omnium circulorum maximorum. </
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">Vnde fit, vt horologiorum
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plana tantum ab ipſis circulis abſint, quanta eſt cuiuſq; </
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">Quam ob rem decipiuntur illi, qui
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docent horologia omnia deſcribi in ipſiſmet circulis maximis, à quibus nomina accipiunt. </
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explicabimus propoſ. </
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rum ſolauum
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diuiſio ſumpta
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@x tẽpore, quo
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horas mõ@trãt.</
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">ALIO modo diuidi ſolent inſtrumenta, quæ hor{as} indicat, ex eo tempore, quo horas monſtr are ſolẽt.
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quæ vel ſplendente luna, vel alijs aſtris, hor{as} noctu oſtendunt: </
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