Huygens, Christiaan, Christiani Hugenii opera varia; Bd. 2: Opera geometrica. Opera astronomica. Varia de optica

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396637 211[Figure 211]
CHRISTIANI HUGENII
DE
SATURNI ANNULO
OBSERVATIONES.
I.
Obſervationes in Saturnum Pariſiis habitæ in Bi-
bliotheca Regia.
ANno 1668, 17 Aug. , hora 11 veſpertinâ Dni Hu-
genius & Picart obſervarunt Planetam Satur-
11TAB. LL
fig. 2. num ope teleſcopiorum 21 pedum & invene-
runt figuram ejus talem qualem hic exhibemus,
globo in medio manifeſte excedente ſupra &
infra ovalem quod vix dum anno præceden-
ti erat conſpicuum.
Menſurarunt diverſimode inclinationem magnæ diametri
Ovalis ad æquatorem, quæ inventa eſt circiter 9 graduum, li-
cet eo empore tantum debuerit eſſe 4 graduum, ſecundum illa,
quæ D. Hugenius dixit in Syſtemate Saturni, planum annu-
li, qui circumdat globum Planetæ cum plano Eclipticæ tan-
tum efficere angulum 23. gr. 3ó; ſed cum ultima hæc obſer-
vatio, & ſimiles aliæ hujus anni & præcedentis, magis exa-
ctæ ſint & habitæ tempore magis opportuno ad menſuran-
dam obliquitatem, illis, quæ fundamentum fuere memo-
ratæ detereminationis, Dus Hugenius invenit, loco 23
gr 3ó angulum plani Annularis & Eclipticæ eſſe circiter 31
22Vera annuii
inclinatio. graduum; & hoc poſito, non ſolum formam, quam jam

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