Motion of the Sun , and solar System. 243 
seventy-seven hundredths, and « Cygni only six. But it will 
be shown, when the direction and velocity of the solar motion 
come to be explained, that these kind of incongruities are mere 
parallactic appearances ; and that there is so general a con- 
sistency among the real motions of the stars, that Arcturus is 
in no respect singled out as a star whose motion is far beyond 
the rest. 
By giving this remark a place among the reasons for admit- 
ting a solar motion, it is not intended to lay any particular 
stress upon it ; for it may be objected that our idea of the 
congruence or harmony of the celestial motions can be no 
criterion of their real fitness and symmetry. But when such 
discordant proper motions as those I have mentioned in stars 
of no very different lustre are under consideration, and may 
be easily shown to be only parallactic phenomena, the method 
by which this can be done must certainly appear eligible, and 
when added to many other inducements, will throw some 
share of weight into the scale. 
Sidereal Occupation of a small Star. 
Of nearly the same importance with the former argument is 
the account of the occultation of a small star by a large one, 
which I have given in my last Paper. When the solar motion 
has been established, we shall prove that the vanishing of the 
small star near $ Cygni, as far as we can judge at present, is 
only a paradactic disappearance. It must be granted that a real 
motion of the large star would also explain the same pheno- 
menon ; but then again, this star must be supposed to move to- 
wards the very same parallactic center which the changes in the 
I i 2 
