Marci of Kronland, Johannes Marcus, De proportione motus figurarum recti linearum et circuli quadratura ex motu, 1648

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1nem æſtimari minorem. Deinde verò cùm per Theor: 19
ab intervallo grad: 60 motus centri fiat per tangentem circu­
li; neceſſe hanc librationem magis augeri.
Vnde etiam ratio
petenda, quòd circulatio quandoque fiat in partem plagæ maio­
ris: cùm videlicet duo orbiculi inæqualiter abſunt à lineâ mo
tûs centri: Hic enim oppoſita circulatio prævalet: quam deter­
minat motus centri per tangentem.
Poſſe verò miſceri motui recto circularem, manifeſtum in
eodem orbiculo; ſi convexâ parte tangat planum. á digito e­
nim compreſſus & eliſus quandoque eidem puncto inſiſtens ro­
tari, quandoque à procurſu recurrere, aut etiam retro agi vide­

tur.
Quòd ſi enim motus circularis fiat æqualis motui recto;
videbitur orbiculus in eodem puncto A circa immobile cen­
trum gyrari.
Dividatur peripheria orbiculi in ſex partes æqua­
les abcdef: & ſumantur his æqualia ſegmenta in lineâ re­
ctâ aghikl. Cùm itaque motus in ab ſit æqualis motui centri
eiuſdem orbiculi in ag; gyratio autem non niſi per contactum

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