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 SEXTVS.
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mus) ita ſinus totus ad aliud, inuenietur ſinus complementi circunferentiæ horizontalis: </
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<
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xml:space
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note-0579-01
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">in Aequatore,
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ex doctrina ſi-
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nuum.</
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complementum hoc, vna cum circunferentia horizontali, notum erit. </
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<
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xml:space
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">Pro deſcenſiua autem circunfe-
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rentia cuiuſcunque horæ accipienda est declinatio paralleli, vt patet.</
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<
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">INVENTIS autem circunferentijs horizontalibus, ſupput abim{us} ill{as} in circulo ex loco ſtyli
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xml:space
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">Deſcriptio horo
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logii æquino-
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ctialis ex circun
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ferentijs hori-
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zon@alibus de-
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ſcenſiuisq́ue in
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Aequatore, tan-
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quam Horizon
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te, inuentis.</
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deſcripto à linea horę 6. </
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<
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">& </
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<
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<
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<
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">quæ lineam meridianam in loco ſtyli ad angulos rectos ſecat,
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eſt{q́ue} inſtar lineæ Verticalis ipſi{us} æquinoctialis horologij, vt horologium æquinoctiale componamus, ſur-
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ſum quidem verſus in ſuperiorihorologio æquinoctiali pro horis, quę maiorem diſtantiam habent à meri-
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die, quàm 6. </
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<
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">horar@m, deorſum vero, ſi minorem: </
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<
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">Per puncta enim hoc modo
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inuenta ducendæ ſunt lineæ horariæ ex centro, ſeulocoſtyli.</
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<
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<
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">CAETERVM omnia, quæ in hoc cap. </
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<
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">eius{q́ue} ſcholio de horologiorum deſcriptione ex circunferen
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tijs horizontalib{us}, deſcenſiuis diximus, meli{us} intelligentur, ſi in memoriam renocentur ea, quæ in ſu-
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periori lib. </
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<
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<
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">Horizontales enim circunferentiæ eæ-
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dem hic ſunt, quæ ibi latitudines vmbrarum, & </
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<
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">deſcenſiuæ eædem, quę complementa altitud inum So-
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lis, & </
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<
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<
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">Quamobrem ſi quid minus recte hic intelligetur, recurrendum erit ad ſuperiorem lib. </
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<
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caneum enim duximus, ea, quæ ibi ſcripſimus, hoc loco repetere.</
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">DE HOROLOGIIS DECLINANTIBVS VEL AVERTICALI,
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vel ab Horizonte, & inclinatis ad Horizontem, & ijs, quæ à Ver-
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ticali declinant, & ſimul ad Horizontem ſunt
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inclinata. CAP. X.</
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<
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inclinatum ad Horizontem, vel declinans à Verticali, & </
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deſcribatur, inueſtiganda primum erit, per propoſ. </
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<
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<
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<
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<
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">altitudo poli ſupra circulum maxi-
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mum, cui horologium deſcribendum ęquidiſtat, & </
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<
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">ad hanc altitudinem Analemma fabricãdum,
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obſeruando diligenter, num polus arcticus, antarcticusve eleuetur ſupra faciem illam circuli ma-
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ximi, cui horologium æquidiſtat: </
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<
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">quod quidem cognoſcemus ex ijs, quæ ad initium ſcholij pro-
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poſ. </
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mo congruens, cui ho-
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rologium declinans à
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Verticali circulo gr. </
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</
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<
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">æquidiſtat, quod & </
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poſ. </
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<
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<
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5. </
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<
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<
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Nam altitudo poli DH,
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complectitur grad. </
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Min. </
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<
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cer ſupra dictum circu-
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lum inuenimus, vt ex ſu
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perioribus conſtat. </
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<
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<
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quoniam polus antarcti
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cus ſupra illius circuli
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faciem auſtralem eleua-
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tur, ſi ponamus H, po-
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lum antarcticum, erit
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k L, diameter paralleli
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♑, & </
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<
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paralleli ♋; </
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<
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ſit arcus ſemidiurnus
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♑, & </
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<
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<
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cturnus, at M P, arcus
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ſemidiurnus ♋, & </
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<
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ſeminocturnus, ſi præ-
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dictus circulus maxi-
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mus eſſet Horizon, in
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quo polus antarcticus
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conſpicuus ſit. </
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<
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">E contrario vero, quia polus arcticus ſupra eiuſdem circuli faciem borealem ele-
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uatur, ſi ponatur H, polus arcticus, erit k L, diameter paralleli ♋, & </
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<
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<
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vt k R, ſit arcus ſemidiurnus ♋, & </
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<
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">L R, arcus ſeminocturnus, at M P, arcus ſemidiurnus ♑, & </
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<
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<
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N P, arcus ſeminocturnus. </
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<
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">Circulus autem A B C D, non refert Meridianum eius loci, in quo
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horologium conſtruitur, ſed Meridianum illius loci, in quo dictus circulus maximus eſſet </
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