292 °N THE PLANET CERtS. 



Determination of In order to afcertain by calculation the heliocentric arc 



Ire pafleT 11 " P a(red throu g h in 390 J di ys, the time contained between 



through, Jan. 1, 1801, at 9 P. M. and Jan. 27, 1802, at 4 A. M. the 



heliocentric longitudes of the new planet may be afcertained 



thus; 



S * ' " 



1801, Jan. 1* 9* fun's long. . . : . 9 11 1 33 



Right afcenfi on of Ceres . . . 1 21 47 48 



Elongation 7 19 13 45 



— L 



Then at 27 (fuppofed diflance) 1,43136 

 Is to fine of 49° 14' . . .,9,87931 

 So is 10 (earth's diflance) . 1,00000 



10,87931 

 1,43136 



To fine of r: aral. of orb. 1 6° 17' 9,44795 



S ° ' 



Again 1802, Jan. 26<* 16 h fun's long. . , 10 6 35 



Right afcenfion of Ceres ..... 6 8 24 



Elongation . . 3 28 11 



Then as 27 . ..... 1,43136 



Sine of 61$ 49' (fupplement) 9,94519 

 So is 10 1,00000 



10,94519 

 1,43136 



To fine of para!, of orb. 19° 3' 9,51383 



Geofcentric place of Ceres i S • ' " • ' 



Jan. 1, 1801 . .1 21 47 48 Parallax 16 17 



Jan. 26, 1802 . . 6 8 24 49 Ditto 19 3 



Whole geocentric arc 4 16 37 1 35 20 



Deduct fum of parallaxes 1 5 20 



Whole heliocentric arc 3 11 17 1 in 390,3 days, 

 and thence ef Now, if the motion of the planet were equable throughout 



the period its orbit, we mould have the whole tropical period from this 



*3*7>*7 »y 8 » fatio ^ as lQl0 1? / j// . 390)3 & . . 360 q . 13 87,27 days, but the 



portion 



