( l to ) 
mined or, at lead, have been redified and confirmed 
by them. 
How near thefe Calculations willanfwer to the Hea- 
vens, muft be left to Time to difcover ; but as the Tables 
that I have made ufe of had received no Corredion for 
fifty Years part, lhave endeavoured, during the fmall. 
Time fincelfet myfelf about this Work, to corred them 
as much as the Time would allow me ; and,! hope, be 
fore the Year comes about, to bring fome of the Sa- 
tellites to anfwer. nearer than they do at prefent, and 
in the mean time, if thofe Gentlemen who {hall have 
an Opportunity of obferving them, will tranfmit their 
Obfervations to the Royal Society, it will contribute 
towards a farther Redification of the Tables. 
I have by me the Times of the Appulfes of the 
Moon to the fixed Stars, and their Occultations, by 
the Interpofition of her Body, for the fucceeding Year 
which I had fome Thoughts of communicating: But 
as the long-expeded Lunar Tables of Dr. Halley will 
very foon be publifhed £ as I am informed) I have de- 
ferred that Affair for another Year.. 
For the Benefit of thofe Perfons who have not been 
accuftomed to make Obfervations of this Kind, I had 
determined with myfelf to have given the Configura- 
tions of the Satellites , at the Times when thofe that 
are vifible in our Hemifphere,. which are marked with 
a Star, will, happen j but as it would have taken me 
up much Time in doing, as well as Expence in grav- 
ing,. I have chofe rather to give fuch People fome In- 
ftrudions, which, if well obferved, will not only 
point out the exaft Spot in the Heavens, where the 
Appear- 
