in the relative Situation of double Stars , See. 343 
Motion. 
Distance 
Angle. 
Quadrants. 
Op 
+ 
— 
1st and 2d 
3 4 
Of 
+ 
1 1 
1 1 
H co 
On 
+ 
+ 
1 3 
— 
2 4 
Os 
+ 
+ 
1 3 
2 4 
3d case. When the angle PaO is less than go degrees, the 
following Table must be used. 
Motion. 
Distance. 
Angle. 
Quadrants. 
Op 
__ 
+ 
1st and 2d 
3 4 
of 
+ 
— 
1 2 
3 4 
On 
*T 
+ 
1 3 
2 4 
Os 
+ 
+ 
1 3 
— 
' — 
2 4 
Double Motions. 
No. 4. If we admit different motions in two of our three 
bodies, and if the ratio of the velocities, the directions of the 
Yy a - 
