Casati, Paolo
,
Terra machinis mota : dissertationes geometricae, mechanicae physicae hydrostaticae
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autem opticus DB terram tangens facit cum
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ſemidiametro angulum DBC rectum. </
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<
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>Igi
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tur recta AB ab angulo recto ad B cadens iņ
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baſim perpendicularis, eſt medio loco pro
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portionalis inter ſegmenta DA & AC. </
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rè diuiſo quadrato maximæ visûs diſtantiæ
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AB per altitudinem AD, prouenit quæſitą
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terræ ſemidiameter AC. </
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<
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pro rectâ lineâ aſſumere parùm Geometri
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cum eſt. </
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XXXX
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Abuſus li
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neæ curuæ
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pro rectą,
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inutilis.
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Merſ.
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methodum, quæ mihi aliquando occurrit
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per circulos Azimuthales; ſi nimirùm duo
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rum locorum, quorum alteruter ex alterius
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editâ turri conſpici queat, nota fuerit diſtan
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tia, & poli altitudo. </
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<
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>In ſummâ enim turri
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planum horizontale conſtituatur, in eoque
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meridiana linea deſcribatur: tum obſeruetur
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ſub quo Azimutho locus alter conſpicuus
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appareat: & ex his datis quæſita eruantur. </
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Sit PAC loci Meridianus, vbi obſeruatio in
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ſtituitur
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; Verticalis per vtrumque locum
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tranſiens AB, cum Meridiano faciat angu
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lum CAB obſeruatum; P verò ſit Polus, &
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AP, BP ſint complementa nota datarum
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poli eleuationum. </
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<
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>Cum itaque in triangu
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lo ſphærico BAP nota ſint duo latera AP,
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BP, & angulus BAP complementum angu</
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