(900)
An Observation
THe Observers, imploying a Telescope of 21 Foot, saw the Planet Saturn, as 'tis represented by Fig. II. the Globe in the midle manifestly appearing both above and below beyond the Ovale of his Anses; which was hardly discernable the last year.
They measur'd divers ways the Inclination of the Great Diameter of the Qvale to the Equator, which (Inclination) was found of about Nine degrees, although at that time it should not be but of Four degrees, according to what M. Hugens hath affirm'd in his Systeme of Saturn, viz. that the Plan of the Ring, which environs the Globe of this Planet, is inclin'd to the Plan of the Ecliptique but 23 deg. 30, m. Bur this last Observation and other like ones of this and the precedent Year being more exact, and made at a time more proper for measuring that obliquity, than were those, which had formerly served for a foundation to determine it; M. Hugens finds that, instead of 23 deg. 30. m. the Angle of the Plans of the Ring and of the Ecliptique must be of 31. deg or thereabout; and that being so, that not onely the Shape, which Saturn hath at present, but also all those, that have been noted since the true ones were observed, do perfectly agree with the Hypothesis of the Ring;See. Fig. 3. as 'tis be found in the French Letters, written by M. Auzout to M. L'Abbé Charles, and printed at Paris, A. 1665. upon the occasion of the Regguaglio di due Nuovo Osservationi da Giuseppe Campani. and particularly that of 1664. in the beginning of July*, which was made, and made publick by Signior Campani, wherein the Great Diameter is double to the Lesser.
As to the round Phasis of Saturn, that Change of the Inclination, was just now spoken of, cannot alter the time of it but very little or nothing; so that M. Hugens still expects this Apparance in 1671. when in the Summer of that Year Saturn will begin to loose his Anses, there being then to remain onely the Globe in the Midle; and will not recover them but about a
