Huygens, Christiaan
,
Christiani Hugenii opera varia; Bd. 2: Opera geometrica. Opera astronomica. Varia de optica
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SYSTEMA SATURNIUM.
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tiori, appulſu nimirum ad fixas inveſtigavit, eadem fere qua
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& </
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">nos amplitudine definiit, paullum tantum excedens: </
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turni enim maximam 72″ continere aſſerit, Jovis item maxi-
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mam 68″, quæ mihi ſunt 68″ & </
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xml:space
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magis in Venere, quam in Jove aut Saturno dimetiendis, er-
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rori obnoxiam eſſe rationem noſtram. </
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<
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xml:space
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">Et Veneris quidem
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diametrum Hevelius quoque, ad Lunæ maculas inſtituta com-
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paratione, tantum 82″ ſe inveniſſe teſtatur cum circa peri-
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gæum verſaretur, unde diameter ejus maxima non multum ſa-
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nè noſtram ſuperabit. </
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<
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xml:space
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">Porro illud in methodo à nobis tra-
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dita commodiſſimum accidit, quod nec Lunæ, nec ſideris cu-
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juſquam conjunctionem, cum eo quem metiri volumus pla-
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neta, opperiri neceſſe eſt, ſed omni tempore ejus uſus con-
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ceditur. </
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<
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">Nec ad planetarum tantum diametros pertinet, ſed
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ad lunares quoque maculas accuratè deſcribendas, comitum-
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que Jovialium diſtantias accipiendas rectiſſimè adhibebitur.
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</
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">Ad planetarum autem diametros longis atque optimæ notæ
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teleſcopiis opus eſſe ſciendum eſt. </
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<
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nere ac Mercurio, ut fuligine leviter inficiatur lens oculo pro-
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xima, quo perfectius planetæ ambitus circùm terminetur.</
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