[ 579 ] 
the befl obfervatlons made in the places whofe longi- 
tudes were very nearly afcertained,the Sun's parallax on 
the 5th of June was found ~ 8^ ,692 And Mr. 
Pingre, notwithflanding the feveral arguments very 
fpecioufly produced in favour of his own obfervation 
at the Ifland of Rodrigues, as reprefented in his 
learned Mernoire on the Sun’s Parallax, will pro- 
bably be" of opinion, that an error of one minute 
was committed in writing down the time of his ob- 
fervation, as was conjedured by many perfons, as 
well as myfelf j a miftake to which the mod: expe- 
rienced obferver is fometimes liable, when at the time 
of obfervation the minute is nearly compleated. 
The parallax on the 3d of June being 8^,65, the 
mean parallax will be found to be =: B'',78 j and 
if the femidiameter of the Earth be fuppofed 
= 3985 Englidi miles, the mean didance of the 
Earth from the Sun will be 93,726,900 Englifli 
miles. And, as the relative didances of the planets 
are well known, their abfolute didances, and con- 
fequently the dimenfions of the Solar Sydem, will 
be as follows. 
Relative didance. 
Abfolute didance. 
Mercury, 
387,10 
36,281,700 
Venus, 
725,33 
^7>795>5oo 
Earth, 
1000,00 
93,726,900 
Mars, 
1523.69 
142,818,000 
Jupiter, 
5200,98 
487,472,000 
Saturn, 
9540,07 
894,162,000 
Oxford, Dec. 17, 1771, 
* See Phil. Xranf. Vol. LIII. for the Year 1763. p. 491. 
4 E 2 LIV. ^ 
