128

Astronomy/

and approved as the only trueof the World , for the following Rea/ 0 * 1(CXXXVIII). (

, t!> e

i'9° 45'" to the opposite Node, the Sun enlightensNorthern Plane of thd Ring, and vicissim. t

7- Sirice Saturn describes about one DegreeMonth, the Ring will .be visible through a good ^scope till within about 15 or 20 Days before and ^the Planet is in the I9 0 45' of Virgo or Pisces- , j|iTime therefore may be found by an Ephem er ' s Jjj,tS

which Saturn seen from the Earth shall be in those V ,ji

■ 1 n „

of the Ecliptic ; and likewise when he will be se eI1 j,eiithe Earth in ig r ' 45' of Gemini and Sagittarius$the Ring will be most open, and in the best Posi t!be viewed. f

8. There have been some Grounds to cohject ure t ydSaturn's Ring tutns round an Axis, but that is £1 p'demonstrable. This wonderful Ring in sensetions does also appear double; for CaJJini in the. ff.1675 observed it to be bisected quite round byelliptical Line, dividing it as it were into twobf which the inner one appeared brighter than th e dThis whs oftentimes observed afterwards with V j,t34. and 20 Feet, and more evidently in the Tse 11 ^'Moon-Light than in a darker Sky. See Phil-abridged, Vol. II. p. 221, 222. - e w,

(CXXXVIII) 1. The sagacious Kepler was tn jjj-rwho discovered this great Law of Nature in all tihary Planets, and afterwards the Astronomersthat' the Secondaries did likewise regulate theirby the lame Law-. I have already exhibited the zi>ir.atical Theory thereof in Annot. XXXIV- * j tl^given an Example in the Earth and Venus. .-J$ ^,

the same Law holds in the System of jg I* 1

Saturn’s Moons, will appear from the folios 1 xstances. n ;st/

2. The first of Jupiter’s Moons iof 2*| of Jupiter’s Diameters from his Centre,

yo*'