( ?7° )

Yhe F hst Satellite Wäs Obferved 45 0 Distant from its Perigee, motingtoward the West, Mar. 11. i6%6.st. n. at ioh 40'. at Night, andretumedfo the sime Position on the 14^ of Astii at the fame Hour.

The Seccnd was 36° Distant from the Perigee tothe West, the 30^ of Mar.i686._/?. «. at 8 a Clock in the Evening.

The First or Innermost Satellite, is never distant from Satum's Ring abovef of the apparent length of the sime Ring ; h makes one Revolution in id.x1 h f 9'. and the Circle of its Orb is neariy in the sime Plain with the*!»£•

The Second or Pcnirttime Satellite is 4 of the Length of the Ring distanttherefrom, and makes his Revolution in x d 1 7h 43'.

After a great Number of Choice Observations it was Concluded, that theProportion of the Digrcfficns of the Sccvnd to that of the First, ( countingboth from the Centre of Satum ) is as xx to 17; and of its Revolution asX44 to 17. This is that very sime Proportion which Regler Observes be-fween the Distanccs and Periods of the Primery Plancts, and which we havefound between the other Satellites of Saturn , and is verisied in the Satellitesöf Jugiter. There is nothing that better stiews the Admirable Harmony ofthe Particular Systemes with the Great Systeme of the World.

The Antient' Astronomers having transtated the Narnes of their Heroesämong rhe Stars,, those Harnes have continucd down to us Unchanged, not-tvithständing the Endeavonr of following Ages to alter them; and Galileoaster their Example, having Hönoured the Haufe of the Medici with the Dif-COVety of the Satellites of Jugiter, made by him under the Protection ofCosinus II. ( which Stars will be always known by the. Nante of Sidera Me -dicea.) Wherefore the Discovcrer Concludes that the Satellites of Satum,bring much more exalted and nlore difficult to Difcover, are not umvorthyso bear the Name of l.ouis Le Grand, under whose Reign, and in whofeObscrvatory the sime have been detected, which therefore hs calls Sidera Lo-doieea, not doubting but to have Perpetuated the Name of that King, by aMonument much more lasting than thosi. of Brasi and Mai ble, which shallbe erected to his Memory.

Tbe^osd* LXXXI. The Fourtb or ■ Penextime Satellite of Satum, first Difcovered byrounb Satellite M. Hugens 1655, I have of late frcquently Obferved with a 14 Foot Tcle-«#***“*» fioge : and I perceived that M. Hugens' % Numbers were. considerably run-out,W. iidscy. 'iwd about 15 0 in xo Years too lwifr; this made me resolve more nicely toa. b enquire into it’s Perlod , and accordingly I waited till I had gölten a Compe-tent Number of Observations, the most Considerable whcreof are thefe.

,68x. Hov. 13. i^h oc/. g. m. the Satellite appeared on the Northfide ofSatum, and a Perpendicular Jet fall from it on the Transverse Diameter ofthe Ring, feil upon the middle of the Dark space of the following Anst ; andthe sime Night 19h oo ; . it had past ehe Conjunction, and the Perpendicularfeli exactly on the Western Edge of the Globe of Satum ; The Northern La-titude, and Retrograde Motion, made k evident that die Satellite was tben in

strigoso.

That,