Apian, Petrus
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Instrvmentvm Sinvvm, sev primi mobilis
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TABVLARVM SINVVM PER PET. APIANVM.
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diuide in ſinũ latitudinis Lunæ maioris, puta 5. </
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bit tibi diſtantiã optatã. </
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<
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pi.</
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gra. </
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<
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in totũ ſinũ, & </
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<
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">hinc diuide ꝓductũ in ſinũ 5. </
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<
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<
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ꝓducet 45. </
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<
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">diſtantiã ſcilicet Lunæ â nodo capitis uel caudæ Draconis Lunæ.</
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tionem ab æquinoctiali.</
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<
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">Propoſitio hæc quũ frequẽtiſsimũ habeat uſum in uniuerſa ſupputatiõe a ſtronomica,
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maxime uero in cõpoſitiõe aliq̊t inſtrumentorũ, ſupputarunt Aſtronomi quandã gene-
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ralem tabulã de gradu in gradũ, unde citra magnũ laborẽ quotidie colligi poteſt declina
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tio Solis. </
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<
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<
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roſcopum numerorũ, ubi etiã minuta totius eclypticæ omnia cõtinentur. </
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<
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clinationẽ, imò & </
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<
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">ipſius tabulæ cõpoſitionẽ uti pſe poſsis cõficere, en rem totã paucis ti
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bi cõmonſtrabo. </
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<
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">Si punctũ habes in eclyptica, cuius declinationẽ ab æquinoctiali ſcire
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deſideras, principio cõſidera, ubi tandem interſectioni æquatoriæ, hoc eſt, primo puncto
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♈ & </
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">♎ punctũ illud exiſtat propinquius, nam ea diſtantia ad hanc operationem requi-
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ritur, ſinum illius ſi multiplicaris, cũ ſinu maximo declinationis Solis, & </
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ris in ſinũ totũ, iam ſtatim ipſe arcus quotientis oſtendet ueluti digito declinationem illi
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us pũcti in eclyptica. </
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<
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<
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xml:space
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">? Sed ne hic quo deſideres exemplũ illuſtrandæ rei adcommo
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dum, age conuerte mihi animũ cogitationem´ tuam ad horam intronizationis, eo tem-
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PLVM
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pore ☉(sun) fuit in 2. </
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">II, hoc ipſum iã punctũ ſtationis uel loci ſolaris uideamus
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ab æquatore diſtantiam. </
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<
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">Ecce principio nobis occurrit, quia ☉(sun) Arieti tunc fuit proxi-
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mus, ideo´ diſtantiã colligemus à principio ♈, q̃eſt 62. </
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88647. </
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<
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">hunc ita ducemus in ſinũ maximæ declinationis eclypticæ, quæ nunc temꝑe
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<
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noſtro agnoſcitur eſſe 23. </
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<
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tum, & </
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<
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☉(sun) quæſitã ipſa hora intronizationis. </
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<
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norum ſpacio nonnihil uariatur, operæpreciũ eſt, ut ipſam interdũ Aſtronomi obſeruẽt
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diligẽtius ex integro, cõſtat enim illi uniuerſam inniti ſupputationem aſtronomicam.</
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<
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fieri poteſt) adhuc gradum illum zodiaci internoſcere, quem iſta declinatio
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tangit, at unum eum eo punctum efficitur.</
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<
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principio ♈ uel ♎, nũc uerſa, ꝓpoſitione docebimus ex ipſa declinatiõe inuenire diſtanti
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am pũcti illius à principio ♈ uel ♎. </
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<
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cæ declinatio illa reſpondeat. </
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<
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<
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maximorũ circulorũ per mediũ in duas ꝑtes æquales diuidũtur, ita ut quælibet pars me
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dia eclypticæ æqualẽ habeat declinationẽ ab æquatore. </
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<
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eclyptica, q̃ æqualẽ habent declinationẽ, ut ſi ꝓponã 10. </
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bita ſimul habeo declinationẽ 20. </
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cipio ♈, ſimili modo intelliges etiã de 10 gradu ♎ & </
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ſitus eſt abinterſectione æquinoctialis & </
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<
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ca, quæ ſingula unã & </
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<
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♋ & </
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<
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">primus etiã ♑ maximam habent declinationem, ne plura ſunt quàm duo hæc
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puncta, quæ æqualem habent declinationem, aliàs ſemper 4. </
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<
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<
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clinationem obtinent, Vt autẽ pronũciati huius operationẽ expeditius & </
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<
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as, duc ſinũ ꝓpoſitæ huius declinationis in ſinũ totum ſiue ꝑfectũ, ꝓductũ diuide in ſinũ
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maximæ declinationis, & </
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<
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