[ ro 5 ] 
XX. Elements of new fables of the Motions 
of Jupiter’* Satellites ; In a Letter to the 
Reverend Charles Mafon, D. D. Wood- 
wardian Profejfor in the Univerfety of 
Cambridge, and R R. S . from Mr. Ri- 
chard Dun t home. 
SIR, Cambridge, March 3, 1761. 
Read^ March 5, f | AHE public employment *, wherein 
j[ I am at^prefent, and for feveral 
years pad have been, engaged, not permitting me to 
make new tables of the motions of Jupiter’s fatellites, 
according to the laft corrections I had (from a com- 
parifon of more than eight hundred obfervations) 
made in the places and orbits of thofe planets, I am 
at laft perfuaded to communicate, by your means, to 
the Royal Society, the elements of thofe tables, 
hoping they will prove no unacceptable prefent to 
aftronomers. 
The tables are defigned upon the plan of thofe of 
Mr. Pound for the firft fatellite, publifhed in the 
Philofophical TranfaCtions, N° 361. except that I 
have not deducted the greateft equations from the 
epochs, as is done by Mr. Pound. 
The epochs of the conjunctions of the feveral fa- 
tellites with Jupiter, fitted to the Julian year (before 
the alteration of the ftyle in England), and to the 
meridian of the Royal Obfervatory at Greenwich, 
are as follows. 
* That of furveyor to the corporation of the great level of the 
fens. 
Vo l. LII. P 
