for ascertaining the distances of clusters of stars, &c. 455 
pole of the milky way and that of the cluster of stars. From 
these data we find the side BC, the complement of which is 
the angle of the elevation of the cluster ; and the angle ABC, 
or its supplement CBD, which gives the degree and the 
quadrant of the azimuth of the cluster. When to these two 
particulars the profundity of a cluster is added, we have its 
local situation, with regard to the plane of the milky way, in 
the required three dimensions of space. 
The following table is the result of a set of calculations 
made for the purpose of obtaining the above mentioned 
particulars. 
