[ J 93 ] 
ment, which depend upon the diftance from the 
edge of Jupiter ; a fma'ilar table I likewife, made for 
each of the three firft fatellites ; but have not yet 
been able, to make fufficient obfervations on the 
fourth. Thefe tables are contained in a long paper of 
mine, which will be publifhed in the volume of our 
Academy for 1771 ; but, if you pleafe, I will fend 
them to you. Thefe fegments being known, it is 
clear, that, befides their variations occasioned by the 
diftance of the fatellite from the edge of Jupiter, 
they will be liable to others. Fir ft, In confequence of 
the change of Jupiter’s diftances, both from the Sun and 
from the Earth. Upon this account, the magnitudes of 
thefe fegments being known, for a particular epoch % 
thofe known magnitudes muft be multiplied by ^1, to 
determine, the magnitude of the fegment at any other 
time. In which expreflion, p and q ftand for the di» 
* Known, by the author’s tables, for any distance of the fatellite 
from the edge of Jupiter, at the particular epoch to which the tables 
are adapted. 
ftances 
de Jupiter ; j’ai drefie une pareille table pour chacun des trots 
premiers fatellites ; je n’ai pu obferver encore, comme il faut, le 
quatrieme. Si vousdefirez ces tables, Mon(ieur,.je vousles envoyerai. 
Elies font dans un long memoire, qui fera imprime parmi ceux de 
I’Academie pour 1771. Ces fegmens etant une fois connus, il eft 
clair, qu’outre les variations que ces fegmens fubiftent,envertudela 
diftance du fatellite au bord de Jupiter, ils varieront encore. i°. Ea 
vertu de la diftance de Jupiter au Soleil, et de Jupiter a la Terre. 
II faudra done multiplier ces fegmens, connus pour une certaine 
epoque, par — , en fuppofant que p et a aient ete les di- 
PP n 
ftances 
3 
