Apian, Petrus
,
Instrvmentvm Sinvvm, sev primi mobilis
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<
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<
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<
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">Duobus locis in gradibus longitudinis & </
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<
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">latitudinis cognitis, in quã mundi partẽ
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alter ab altero declinet (angulũ hũc poſitionis alio nomine dicimus) inueſtigare.</
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<
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<
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<
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gnita, alterius autem utra ignota, angulus autem poſitionis ab altero conſtet
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unà cum diſtantia ad alterum, inſuper eleuationem poli alterius loci, longitudi-
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nem etiam ſiue diſtantiam longitudinis indagare.</
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<
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<
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">Cognita tantum unius loci propoſiti eleuatione polari ſimul et alterius, at hinc
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etiam interca pedine habita inter utran, differentiam adhuc longitudinum & </
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<
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gulum poſitionis ab altero ad alterum inuenire.</
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<
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<
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">Si trium locorum nota ſit intercapedo, duo etiam loca ex ijs cognitas habeant ſuas
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tum latitudines tum longitudines, adhuc tertij longitudinem & </
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<
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">latitudinem, an-
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gulum´ poſitionis, inquirere.</
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<
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<
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">Arcum circuli uerticalis concluſum inter meridianum & </
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ius ſtellæ ſiue puncti in cœlo extra eclypticam, uel in ea conſiderare & </
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<
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">Altitudinem poli arctici ſuper ſemicirculum poſitionis breuiſsime & </
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inueſtigare.</
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<
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<
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<
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">Altitudine poli Borealis ſuper ſemicirculum poſitionis cognita, etiam arcum æqua
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toris inuenire, qui meridiano & </
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<
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<
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">Quum iam altitudo poli ſuper ſemicirculum poſitionis cognita eſt, de hinc arcum
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circuli uerticalis inter zenith & </
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<
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">iſtũ ſemicirculũ poſitionis cõcluſum inueſtigare.</
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<
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">Si arcus æquatoris à meridiano ſumatur uſ ad ſemicirculum poſitionis, altitudi-
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nem per hoc poliſuper ſemicirculum illum poſitionis perquirere.</
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<
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">Altitudinem poli ſuper ſemicirculum poſitionis per arcum æquatoris inter eum & </
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meridianum concluſum, diuerſa ratione colligere.</
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<
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<
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">Declinationem ſtellæ ab æquatore, ſi quam habet, cognoſcere.</
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<
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">iucundiore modo perquirere.</
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<
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">Aſcenſionem rectam ſtellæ inuenire, puta gradum æquatoris, qui cum ſtella propo
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ſita meridianum ſiue horizontem rectum attingit.</
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<
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<
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">Altitudinem poli ſupra horizontem quacun hora noctis, quum ſtellæ uidentur,
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per totum annum ſine omni inſtrumento artificioſe dignoſcere.</
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<
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">Punctum iſtud eclypticæ cum quo ſtella ſeu punctum quoduis cœli medium tan-
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git, perſcrutari.</
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<
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">erraticarum adinuenire.</
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">erraticarum quàm expeditiſsime cognoſcere.</
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">eius etiam aſcenſionem obliquã in æquatore perſpicere.</
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<
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<
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">erratica, ſimiliter & </
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ud quoduis punctum imaginarium Primi Mobilis ſuper horizontem obliquam
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aſcendit, uel eum tangit, aut etiã in parte occidua demergitur, ſolerter indagare.</
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<
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<
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<
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">Interuallum apparitionis aut occultationis ſtellarum in arcu eclypticæ, ſubtiliter
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explorare.</
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<
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<
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<
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<
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">Duarum ſtellarum fixarum uel errantium, diuerſas´ latitudinum denominationes
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habentium, diſtantias ab inuicem colligere.</
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<
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<
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<
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">Altitudinem ſtellæ ſupra horizontem exiſtentis, in omni regione omni´ hora ex-
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acto calculo indagare.</
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<
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<
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<
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<
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<
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ortum Solis, maximam Solis declinationem dignoſcere.</
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