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

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[217] Pg. 700TAB. LIII.4 3 2 1 Annu Sat. lus
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[220] Pag. 704.TAB. LIV.Fig. 1.Satu@@i. Jovis. Martis. Telluris. veneris. M@rc. ♎ Sol. ♈ VS
[221] Fig. 2Saturnus. Tellus. Luna. A C D R S K M G H T V N L Q Y P E F B
[222] Pag. 712.TAB. LV.Fig. 1.Sol.Sat.Jup.MarsTellusVenusMerc.
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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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