if pofilble, two exadf obfervations of her Apparent place a- 
mong die Fixt pars being made, at two places thus diftant in 
Latitude, - and as near as maybe under the fam t Meridian, by 
thefe Obfervators concurring at the fame time, her true and 
cxad: drftance may be hence collected, not onely for that 
time, but at all other times, by any (ingle Obfervator’s view- 
ing her with a 7 and meafuring exactly her Apparent 
Diameter. It were like wife definable, that as often as there 
happens any confidcruble Eclipfe of the Sun, that this alfo 
might be obferved by them, noting therein the exadt mea- 
sure of the greateft Obfcuration compared with the then Ap- 
parent Diameter of his Disk. For by this means, after the db 
itance of the Moon hath been exactly found 5 the diftance of the 
Sun will eafily be deduced. 
As for the time, fitted; for making Obfervations of the 
Moon , that will be,whenfheis about a Quarter or fomewhat 
Icfs illuminated, becaufe then her light is not fo bright, but 
that with a good Telefcope (lie may be obfervki to pafs clofe 
by, and fometimes over feveral Fzxt flars $ which is about 
four or five days before or after her Change : Or elfe at any 
other time, when the Moon pafles near or over fome of the 
bigger fort of Fixt flats, fuch as of the firft orfecond Mag- 
nitude-, whichmay be eafily calculated and forefeen : Or belt 
of all, when there is any Tc^// Eclipfe of the Adeon; for then 
the CmalleixTelefcopieal flars may be feen clofe adjoyning to the 
very body of the Moon. Of all which particulars the two 
Correfpondents are to agree, as foon as he 5 that is tojoyn a- 
broad, fliall be found out ; whereupon they are mutually to 
communicate to each other, what they fliall have thus obferved 
in each place. 
Of an Obfervation , not long fince made in Eng- 
land, of Saturn. 
This Obfervation was made by Mr, William Ball , accom- 
