, ( 4^42 ) 
towards the piiddle of the Belt, From 9 a clock $ minutes 
aod 40 feGODdSsUotill 9 a clock and § rainutes.they Taw it ie the 
midft of the Be!t^ Ac 9 a clock and 1 5 minutes ic was paffed 
rhe middle.aod was come nearer to ihe Occidental limb. And 
a little after the Hea\rens being over caft^ he could then ob- 
ferve it ooTurther, , 
This Obfervatioo being taken for ihe Epocha^ it is eafie to 
ind hereafter the times^when this Spot ftiali return tot the midft 
of the Belt* Foryou are only to add alwaies 9 hours and fi 
iiiiiiutes3and3for ^eater precifenesV fake^notto oaiit the or- 
dioary Equation of days^that depends from the inequality of 
rhe motion of the Sun in refpeft of the Equinoctial^ nor the 
particular Equation, that depends from rhe inequality of the 
iBOtion of Jupiter according to the diverficy of the diftanceof 
the Sun afnd his Apogee. 
This Revolution being the fwifceft and the moft regular that 
is hitherto known in the^Heavens, a Travellour alone', even 
without having any correfpondence with other ObferverSj 
may make ufe of it to find the Longitudes the moft remote 
places of the Earth. We fliall hereafter examine^ to what 
precifcnefs we may arrive by this way* 
Qbfervations @f a New Comer^m^^*? M Paris^'^ fhe 'Royal Ohfervo 
tmjf Sigmr C^iEn'u 
>T~^Here now appears a Comet, jyhicb feems to be near the 
i end of his Appearance^and which might have been feen 
above a month fince^ if the weather had been favourable^ Btrt 
he being very fmall.and having been a long while obferved by 
the beams of the Sun^to which he was nigh, and afterwards by 
the Moon, which was greatly advanced in her lighr^ befides 
that the Heavens in thefe parts have often been over-caft we 
have not obferved him but lately^ 
The Mathematicians of ia Fkfche perceived him from the 
16 of Marchj and gave us here at Paru the firft notice of if. 
Thofe of the College of Clermont being advertifed of it faw 
him the 2 %th of the fame month. And upon notice p^iven of 
itto thQ R.Jcademy of the Sciences by P.Pardies^ Profelfor of the 
Mathematicks in the ColkgQ o[ Clermgnt , Signor Cajfrn hath 
^ver fince been obferviDg him aim the weather did per- 
mit ■ - ■ - ^ ^ " 
MarA 
