82 
of the parabolic hypothesis with three complete observations 
very remarkable ?” 
** Markree Observatory, Collooney, 
“5th May, 1854. 
* Dear Sir,—A set of elements can hardly be regarded 
complete without the addition of the constants for facilitating 
the computation of the heliocentric co-ordinates. They are 
here subjoined,— 
x=asin(A + vy) secs pv 
y=bsin(B+yv) sec*} v 
z=csin(C+r) sec’ v 
log. a = 9°2990850 + 20°0 d 
log. b = 9°3470892 — 12:4 d 
log. c= 94044724 - 28d 
A = 198° 56'54"2 — 0:25 d 
B= 334 54 32 °5-0°57d 
C= 82 53 25-7+0°28d 
1354, Greenwich “Values of de 
Mean Time. 
T= March 24-01376 March 22, —O°77 
1:04 
log += 08361840 April 1, +027 
qz 1:08 
11, + 1°35 
1:19 
log m=0°7963117 21, + 2°54 
v= True anomaly. 
m = Mean daily motion, if Barker’s table be used. 
q = perihelion distance. 
T = time of perihelion passage. 
‘« The longitude of the ascending node was diminished 16”, 
in deducing the constants from the elements: this referred 
the axis of x nearly to the apparent equinox of March 31; 
the small equations annexed will reduce precisely to the ap- 
