Apian, Petrus
,
Instrvmentvm Sinvvm, sev primi mobilis
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<
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xml:space
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<
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alio nomine circulus horarius dicitur, quantus ille ſit à polo mundi arctico uſ ad
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horizontem, per ſupputationem triangularem cognoſcere.</
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circulus horarius in corpore ſphærico tangit horizontem, inuenire.</
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adhuc alia quadam ratione inueſtigare, iſtũ inquam, qui per locũ Solis ptenditur</
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<
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<
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<
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huc alia ea´ omnium facilima ratione perquirere.</
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ptum exacta & </
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<
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">Arcum circuli uerticalis, quem abſcindit circulus horarum, adhuc diuerſo modo
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inueſtigare.</
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ſuperficie plana horizontali inclinantur, & </
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ridiani ad angulos rectos ſunt compoſitæ.</
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">Cognito iam antea eclypticæ gradu, qui eſt in a ſcendente, ſimiliter & </
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æ quinoctialis coaſcendente, eleuationem poli inde elicere.</
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<
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& </
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cæ in eadem regione coaſcendentes) inde quo eleuationem polarem eius regio
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nis, in qua fit talis aſcenſio, colligere.</
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tis, altitudinem poli inde perquirere.</
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<
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de cognoſcere.</
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<
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arcuper polos mundi & </
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moueatur, dijudicare.</
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cæ propoſitus à principio uſ in finem pertranſeat circulum uerticalem.</
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<
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ad totam eclypticam.</
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exiſtat, ſed ad meridianos eorum pertingat duplex eclypticæ pũctum etiam igno
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tum, adhuc inſuper cognoſcere latitudines & </
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<
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triuſ etiam eleuationem poli perſpecta, differentiam longitudinum inter eas cõ
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cluſum inuenire.</
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dem habeant uno momento aſcendentem uidere.</
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tem differentia longitudinum, iam´ ex ſuperiori pronunciato inuentum ſit, eas
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eodem momento quotidie ſemel aut bisunum habere aſcendentem, punctũ iam
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iſtud eclypticæ in aſcendente expedite indagare.</
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nes notæ, at inæquales, diſtantiam inter ea ſecundum uiam directã inueſtigare.</
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diſtantia ignota, inde latitudinem alterius elicere.</
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diuerſis ſubiaceant meridianis, cognita etiam differentia longitudinis, adhuc eo-
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rum inſuper diſtantiam cognoſcere.</
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