A 'Relatim iff the K^^^^m of W Greatf ermaaent S^otmthePianet 
]npmr^oifewed by Signor CzSim^om of the Parifian A- 
cademy vf the Sciences, 
I S now above fix yearSjtMt Signov C(^Jfmi publifhed the 
Theory of two forts of Spots.zi certain times to be fcen 
in the Difque of J/^/iW 
fort are nothinptit the Shadows of ^^^^^^^;^^f 
t c r> W i^ 1 • 1 I 1 J r ^/^^e permanent i>3<? 
the rour Satelht^^ which he had orten very in this rkmt hen in 
well obferved, when thefeSatelHts, moviDg England Hook 
through the lower part oi their Imall circles hefeen^^A.^^- ^^w- 
that eiaviron 5^z^^/>^r5did pals between him pand^ith 't\''A'p.%^ 
and the Sua which illuminates hira^ making 209!n^\'5.p!?4^^ 
a kind of Solar Eclipfe, like that which the 
Moon makethj when fhe is between the Sdn and the EartbJ 
1 hefe Spots^as he obferved from that time, have this peculiar^ 
which diftinguifhath them from all others, that they are pre- 
cifely found in that place of jf2^/?f^^r, where lome Satellit es feea 
by the Sun 5 they go from the Oriental limb to the Occi- 
dental of the Difque of J^^i^^^r with.ainotion alwaies equal to 
that of theSatellit J that in refpeft to us they preceed the Sa-- 
tellit before the oppofition of Jupiter to the Sun, and follow 
him after the oppelition; thattht further Jupiter is diftant 
from the oppofitiouythe greater is the apparent diftance of the 
fame Satellite thatzt divers times of the Year this diftance 
changeth in proportion of the annual Parallax of the Satellite 
according as he is differently leen by the Sun and by the Earthy 
and that at one and the fame time of the year, when divers Sa- 
teliits happen to be between Jupiter and the Sun 5 the Spots 
correfpoadent to them are diftant from them in proportion of 
the femi- diame ters of the circles of the fame Satellits* 
The fort of Spots havemo dependance at all from the 
SatelJitSjbut it feems^that they have fome refemblance to thofc 
Spots that fometimes appear in the Sun^or to ihofe that are al« 
waies feen in the Moon 5 and they are perhaps qf the fame na-- 
ture with thofe^that are called Belts.Thek Spots do alfo move 
from the Eaftern to the Weftern limb of Jupiter s difqm hat 
their apparent motion is unequalj and fwifter near the Center 
than the Circumference 3 and they never are fo wellfeenas 
when they approach to theCenter^ they being very narrow 
and almoft imperceptible, when they approach to the Circum- 
P ppp ference: 
