(*4J> 
the fecond Face oiMars, he could not fee it the 14. and 16. of 
April. 
From all which Qbfervations he Judges it to be evident, that 
the Period of this Planets Re volution is not perform’d in the 
fpace of 1 2. hours 20, minutes, but in about 24 hours 40 mi- 
nutes *. more exactly to be determin’d by comparing diftant 
Obfervations : And that thofe who affirm the former,muft have 
been deceived by not well diftinguiffiing the two Faces, but 
that having feen the fecond, taken it for the firft. 
All which he concludes with this Advertifement, that, when 
he defines the time of the Revolution of^zr/,he does not fpeak 
of its Mean Revolution, butonely of that, which he oblerv’d, 
whilft Mars was oppofite to the Sun; which is the ffiorteft of all. 
The Figures of the Principal Ohfervations , reprefented in 
the Book here difcourfedof r may he feen in the annexed 
Scheme ; videl. 
K* One of the Faces of Mars, as S. Caffini obferved ?>March 
(ft.n.) 1 666. in the Evening, with a Glafs of 24 Palmes. 
~L.Jbe other Facets he Jaw it Febr \ * in th Evening. 
M. The fir ft Face, as b\Campani faw at Rome , March g. 1 666, 
in the Evening , with a Glafs of 50 Palmes. 
N. The fecond Face 3 as the fame Campani obferv’d it March £|,-. 
in the Evening. 
O. T he Figure of Mars, as it was feen at Rome by a Teh fiop&of 
Divini of 45 Palmes, March ff. 
P. The Figure of the [aid Planet, as it was feen the fame day and' 
htour at Bononia by Caffini; being that of the [econd Face . 
Some Ohfervations 
Lately made at London concerning the. 
Vianet Jupiter . 
lliefe, as they were made, fo they were imparted, by Mh.. 
Moo^ as follows ; 
A. 1666. lune 2 6 . between 3. and 4. of the Clock in the- 
morniag, I obferved the Body of Jupiter through a 60 , foot- 
glafs; and found the apparent Diameter ©fit through the Tube, 
to be fomewhat more than 2.. degrees,, that is, about four 
... lihl ' r timess 
