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in Excufe of this Trouble, farther than that 1 havl 
the Honour to be with great Refpeft, 
SIR, 
London , Jan. 14, 
1746-7. Your mofl obliged, 
and humble Servant, 
Richard Brocklesby. 
XIII. A Letter from Mr. Richard Bunthorne, 
to the Rev . Mr. Cha. Mafon, F. R. S. and 
Wood wardian FrcfeJJor of Nat. Hift. at 
Cambridge, concerning the Mcoru* Motion. 
S I R , Cambridge , Nov. 4. 1746. 
Read Feb. 5. IT N the Preface to my lunar Tables, I 
3746 7 JL hinted, that one Ofe of publifhing 
thofe Tables -would be, the affifting of Perfons defirous 
farther to reftify the lunar Aftronomy, by enabling 
them more readily to compare the Newtonian Theory 
with Obfervations. 
Since the Publifhing thofe Tables, I have fpent 
fome Time myfelf in that Companion, and here 
fend you the Refill r, that you may communicate it 
to the Royal Society , if you think it deferves to be 
made public. 
As the Motion of every fecondary Planet mud 
partake of the Errors in the Theory of its primary, 
I thought proper, before I undertook the Examina- 
tion of the lunar Numbers, to compare thofe of the 
Sun with Obfervations. I compared feverai Sets of 
Mr, 
