Colonel Beaufoy cni the Diurnal Variation of the Needle* 403 
Longitude of the perihelion, - 9® 19° 16' 0" 
Inclination of the orbit, - - 80 0 
Logarithm perihelion distance, - 0.35178 
M. Bouvard, Director of the Royal Observatory at Paris, has 
published the following elements in the Ann, de Chimie et Phy^ 
sique. 
Passage of the perihelion, 1819, August 3. 2 hours. 
Longitude of the node, - - 9® 8® 39' 
Longitude of the perihelion, - - 0 3 15 
Inclination of the orbit, - - - 4 5 15 
Perihelion distance, - - - 0.53459 
The elements computed by MM. Rumker, Santini and Ni- 
colai, agree very well with one another ; but those of M. Bou- 
vard are so widely different from them, that we are forced to 
conclude, that some very serious error has been committed in 
the observations, or, what is far more likely, in the calculations 
of the French astronomer. 
Art. XXXV. — Quarterly Abstract of the Diurnal Variation 
of the Magnetic Needle. By Colonel Beaufoy, F. R. S. 
Monthly mean Variation of the Magnetic Needle, 
Variation West. 
1817. 
1818. 
1819. 
{ Morning, 
24° 31' 52" 
24° 34' 06" 
24° 32' 36" 
April. < Noon, 
24 44 43 
24 44 50 
24 43 09 
(^Evening, 
24 35 58 
24 36 36 
24 34 59 
f Morning, 
24 32 20 
24 36 18 
24 32 42 
May. -j Noon, 
24 42 35 
24 45 49 
24 41 22 
Evening, 
24 34 45 
24 38 35 
24 34 10 
C Morning, 
24 31 09 
24 33 47 
24 31 28 
June. •< Noon, 
24 42 14 
24 45 11 
24 41 41 
Evening, 
24 34 45 
24 37 40 
24 35 09 
f Morning, 
24 31 14 
24 34 24 
24 32 31 
July. J Noon, 
24 42 06 
24 44 59 
24 42 12 
Evening, 
24 35 43 
24 38 14 
24 35 37 
Bushey Heath, 
Stanmore, Aug, % 1819^ 
