Musschenbroek, Petrus van
,
Physicae experimentales, et geometricae de magnete, tuborum capillarium vitreorumque speculorum attractione, magnitudine terrae, cohaerentia corporum firmorum dissertationes: ut et ephemerides meteorologicae ultraiectinae
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celerior, quam fuit ab Ortu ad verum Septentrionem, nam anno 1610
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declinabat Acus 8 gradibus verſus Ortum, excurrerunt inter 1610 & </
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1666 anni 56, quemadmodum inter 1666 & </
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<
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<
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tus ab Ortu ad Boream fuit 8 graduum, poſtea æquali annorum in-
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tervallo fuit a Borea ad Occaſum 13 graduum, patet ergo hunc po-
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ſteriorem motum eſſe celeriorem.</
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">Ut igitur motu medio 14 Minutorum Acus
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Declinatio integrum circuitum abſolvat, indigebit ſpatio 1542
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Annorum circiter, uti patet, ſi integer circulus 360 Graduum divi-
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datur per 14 Minuta. </
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">Fatendum tamen eſt, hoc eſſe admodum incer-
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tum: </
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<
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">imo de ejuſmodi motu medio non interſe conveniunt Philo-
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ſophi, Noëllius enim in Obſerv. </
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<
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<
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9 {1/2} vel 10 Minuta: </
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L’ Acad. </
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">ipſique alii modo attribuunt 9 Minuta, in-
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nixi obſervationibus captis Londini; </
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finem duxi: </
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<
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# Anno # Grad. # M.
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a Burrough # 1576 # 11 # 15
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# 1612 # 6 # 10
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a Guntero # 1622 # 6 # 0 # Verſus Ortum.
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a Gellibrando # 1634 # 4 # 5
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a Bondio # 1657 # 0 # 0
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# 1665 # 1 # 22 {1/2}
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# 1666 # 1 # 35? 36?
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ab Halleyo # 1672 # 2 # 30 # Verſus Occaſum.
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# 1683 # 4 # 30
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# 1692 # 6 # 0
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# 1700 # 8 # 0
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Declinationis mutatio 19°, 15`. </
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deunt pro uno Anno 9 {39/124} Minuta: </
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nem Magnetis Berolini, hanc adnotavit</
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