MATHEMATICAL PAPERS to 
Hadley's quadraht, and a tolerable’ deco iei "The eclipfes of 
Jupiter's fatellites being fo frequent, and of fuch eafy. obfervas 
tion, ‘they prove very favourable phenomena for this purpofe. - ; 
But where great accuracy is required, a folar eclipfe or an 
occultation or a ae mA the. dark fide f the ends to be 
prefered. - "hd 
m in this and fome NH u he Ff gg 
been determined in refpe& to each other, with much precifion, 
from obfervations of late years. Such as fhall be made i in. fu- 
ture, may corre& fome errors of the prefent.- 
The following obferVations were madè with much c care and 
attention. - The clock was an excellant good one, regulated. b 
equal altitudes of the futi taken’ by- refle&ion with Hadh s 
quadíant +“ Kt was counted bet pee AM aed to d the thing ; ; 
tion of edt! danik for de RE or urate oF ae Are s 
declination; —— 
Gen we afd, isa seeing telefeope, made’ EA finr. 
3 VS Satelite - icii A Satelite. 
; t E App. Time — 
adl) gars gp May 9p em m 
May 8, : $197 June 26,4 —— 8 39 ia so 
seggi C 19 52 7 s Satellite; ’ 
Jane 23, 9 16 40 ‘May 16, 8 54°20 7 5 
ME ES. es 23). "r2 124 49^ E 
og eg 8 | June 28, gp 
T Obfervations. 
