222 Dr. Herschel on the Quantity 
which the calculation assigns to the sun : this consequently 
fixes one of the limits to which the solar motion ought not to 
come up, if we intend it should hold a middle rank among the 
sidereal velocities. 
On the other hand,. by a similar calculation of the velocities 
of the star Pollux and the sun, it appears that a solar motion 
of o",- 967754 will make them equal ; and that a diminution of 
this motion not exceeding o",oi would give us 19 stars 
moving at a greater rate than the sun, and only 17 falling 
short of its velocity. This consequently fixes the other limit 
to which the solar motion ought not to be depressed. And 
thus it appears by this method, that the quantity we are 
desirous of ascertaining, is confined within very narrow 
bounds, and that by fixing upon a mean of the two limits, we 
may have the rank of the solar motion true to less than 
o",i 5- 
Calculations for investigating; the Consequences arising from any 
proposed Quantity of Solar Motion , and for delineating them 
by proper Figures. 
Before we can justly examine the real motions of stars which 
it will be necessary to admit in consequence of a given solar 
motion, it will be convenient to have them represented in two 
figures that we may see their arrangement and extent ; and 
as a calculation of the required particulars will oblige us to 
fix upon a certain quantity, we shall take the motion that has 
been ascertained to belong to the middle rank of the sidereal 
velocities for a pattern. The result of the -necessary calcula- 
tions is as follows. 
