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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<
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xml:space
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">PORRO vſus parallelorum, ſiue arcuum ſignorum Zodiaci in omnibus horologijs eſt, vt per eos ſcia
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">Vſus arcuum
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ſignorum in ho
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rologio deſcri-
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p@o@um, quibus
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diſcimus, qua
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in parte Zo-
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diaci Sol exi-
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ſtat.</
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mus, quonam in ſigno Zodiaci Sol quotidie verſetur. </
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<
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xml:space
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">Quotieſcunque enim vmbræ extremitas in aliquem
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arcum in horologio deſcriptum cadit pręcisè, ac proinde toto illo die ab eo minimè recedit, exiſtet neceſ-
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ſario tunc Sol in prineipio illius ſigni Zodiaci, quod arcus prędictus repræſent at. </
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<
s
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xml:space
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">Quando autem non prę-
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cisè in aliquem arcum cadit vmbra, ſed in ſpatium inter duos arcus concluſum, non verſabitur tunc Sol
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in principio alicuius ſigni, ſed vel iuxta princi@ium, vel in medio, vel prope finem, vel deniq; </
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<
s
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xml:space
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piam parte illius, pro proportione diſtantiæ vmbrę ab arcu illius ſigni. </
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<
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xml:space
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">Vt autem cognoſcamus, quodnam
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duorum ſignorum, quæ cuilibet arcui, (exceptis duobus tropicis) ſunt aſcripta, accipiendum ſit, obſeruan
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dum erit, quanam in parte anni verſemur. </
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<
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xml:space
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">Nam cum à duodecimo die Iunij vſque ad diem duodecimum
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Decembris, percurr at hac tempeſtate Sol hæc ſex ſigna: </
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<
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">Alia autem ſex, vt ♑,
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♒, ♓, ♈, ♉, & </
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<
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">♊, à die duodecimo Decembris vſque ad duodecimum diem Iunij, facile quibet iudica
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re poterit, in quonam duorum ſignorum Sol existat. </
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<
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">Si in aliquo die inter duodecimũ
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Iunij, & </
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<
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">duodecimum Decembris extremitas vmbræ præcisè cadat in arcum, cui appoſita ſunt duo hæc
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ſigna ♊, & </
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<
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">♌, exiſtet Sol in principio ♌, non autem in principio ♊: </
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<
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inter dictum arcum, & </
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<
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">arcum alium horum duorum ſignorum ♉, & </
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<
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">♍, comprehenſum, verſabitur Sol
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in aliquo gradu ♌, non autẽ ingradu aliquo ♊, vel ♍, vel ♉; </
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<
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xml:space
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">quia illo anni tempore non poteſt eſſe in ♊,
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vel ♉, vt diximus, ſed vel in ♌, vel in ♍; </
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<
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">cum ergo Sol moueatur à ♌, in ♍, & </
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<
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">non è contrario, effici-
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tur, illum tunc exiſtere in gradu aliquo ♌, non autem ♍. </
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<
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">Contrarium eſſet intelligendum, ſi in ea parte
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anni, quæ inter duodecimum diem Decembris, & </
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<
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">duodecimum diem Iunij ponitur, verſaremur. </
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<
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">Nam tunc
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vmbra cadente in arcum ♊, & </
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<
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xml:space
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">cadente autem vmbra in idem ſpatium
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inter dictum arcum, & </
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">arcum ♉, & </
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">♍, contentum, conſtitutus eſſet Sol in gradu aliquo ♉, quia à ♉, in
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♊, proprio motu progreditur. </
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">& </
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<
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<
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<
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">PARALLELOS arcuum diurnorum in eodem horologio ho-
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rizontali deſcribere.</
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<
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">CVM paralleli arcuum diurnorum æquidiſtent Aequatori, quemadmodum & </
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<
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">paralleli ſigno
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cuum diurnorũ
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in pradicto ho-
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rologio norizon
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tali.</
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rum Zodiaci, perſpicuum eſt, eandem eſſe & </
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<
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">illorum, & </
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<
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">horum deſcribendorum rationem. </
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<
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ſi in priori modo deſcriptionis pręcedẽte propoſ. </
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<
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">tradito, loco parallelorum, qui per ſigna Zodia-
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ci ducuntur, ſumantur paralleli arcuum diurnorum, quorum declinationes propoſ. </
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<
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<
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tis libri inuentę ſunt: </
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<
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xml:space
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">in poſteriori autem, loco radiorum Zodiaci ex puncto D, egredientium aſ-
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ſumantur radii arcuum diurnorum, vt ex his figuris appoſitis patet, in quarum priore continen-
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tur paralleli, quorum arcus diurni horas continent 8. </
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<
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<
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number
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<
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0189-01
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xlink:href
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http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/xxxxxxxx/figures/0189-01
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</
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verò radij parallelorum, quorum arcus diurni continent horas. </
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<
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<
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xml:space
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">& </
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<
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">ſic deinceps
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vſque ad 24. </
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<
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">vbi totus parallelus eſt arcus diurnus; </
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<
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">deſcribemus parallelos arcuum diurnorum ea-
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dem prorſus arte, qua parallelos ſignorum pręcedente propoſ. </
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<
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<
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conicæ ſectiones ſunt, quas vinbra ſtvli deſcribit, ex coroll. </
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<
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<
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<
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exiſtente. </
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<
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</
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<
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">SVNT autem extrem@e lineę in figura radiorum ex H, eductę lineis extremis ex D, emiſſis pa-
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