C ^37 ) 
11. MoH^mCaffm his M^w and Exa^ Talks f or the Edipfes ^^ 
the Ftrfi Satellite of Jupiter, reduced to the }\x\mx Stile, and 
AMong the Books the Royal Academy of Sciences Paris has 
lately gratified the World withal, there is one which has 
for Title, Pt^ecueuil d' Ohfer vat ions faites en flufiems Voiages pour 
parfeiiionner{ I' Aflronomie & la Geographie^ Avec divers trait ez 
Aftronomiques, In which thofe Sc^ix'w have let a very com- 
mendable Exarn pie in afcertaining by undoubted Obfervatioos 
the true Geographical Site of all the Principal Ports of France , 
which it w^ere to be wilhed other Nations would imitate* By 
this Survey they have demonftrated the Encroachments their 
GeographerSy ^and particularly Sanfon^ had made pn the Sea to 
enlarge their Kingdorrt, and have retrenched more of theiij Ufur-» 
pations on the Wefiy Souths and Norths than all their Acquifis 
on the Eafi amount to twice told. 
The Method they have ufed to,determine the Longitudes of 
l;heir Places, is by the Obfervation of the Eclipfes oi Firjl 
Satellite Jupiter^ which they find alcrioft inftantaneous, and 
with good Telefcppes difcernable almoft to the very Oppofition^ 
of Jupiter to the 5«» : And it may be laid, that this Account of 
the Longitudes obferved, has put it paft doubt that this is the 
very beft way, could portable Telefcopes fuffice for the Worlf. 
And could thefe Satellites be obl^rved at Sea,^ Ship at Sea might 
he enabled to find the Meridian flie was in, by help of the Ta- 
bles Monfieur C^j/^/^i has given us in this Volume, diftoveriDg 
with very great eKa&pefs the faid Eclipfes^ beyond what we can 
yet hope to do by the Moon, tho' flie feem to afford us the only 
means Prafticable for the Seaman. However before Saylors can 
make ufe of the Art of finding the it will be requi- 
fice that theCoaft of the whole Oceanibe firil laid downitruly, 
for which work this fvI^thGd by' tm Satellites is\mQii ir^ 
And it may be hoped that either the true G^^Bi^trick Thscry 
of the Moon may be difcovered , by the time the Charts are 
O o com- 
