( 6 5 1 ) 
the Equinox, upon Suppofition that the Alteration 
from this Caufe is proportional to the Time, and regu- 
lar through all the Parts of the Year. I have deduced 
the real annual Alteration of Declination of each Star 
from the Obfervations themfelves ; and I the rather 
choofe to depend upon them in this Article, becaufe all 
which I have yet made, concur to prove, that the Stars 
near the Equino&ial Colure, change their Declination at 
tins time i" ; or 2" in a Year more than they would do 
“ r f * rece ^ 10n w as only 50", as is now generally fup. 
poled. I have likewife met with fome fmall Varieties 
m the Declination of other Stars in different Years 
which do not feem to proceed from the fame Caufe, par- 
ticularly in thofe that are near the folftitial Colure 
which on the contrary have altered their Declination 
ieb than they ought, if the Preceffion was 50". But 
whether there fmall Alterations proceed from a regular 
Caufe, or are occafioned by any Change in the Mate- 
rials fee. of my Inftrument, I am not yet able fullv 
to determine. However, I thought it might not be a- 
mifs juft to mention to you how I have endeavoured to 
allow for them, though the Refult would have been 
nearly the fame,, if I had not confidered them at all 
Whatthat is, I will fhew, firft from the Obfervations 
Of- y ‘Dracoms , which was found to be 39" more South 
erly in the Beginning of March, than in September 
From what hath been premifed, it will appear that 
the greateft Alteration of the apparent Declination of 
y pr acorns, on Account of the fucceffive Propagation 
0 , L [Sht would be to the Diameter of the little Circle 
which a Star (as was before remarked) would feem to 
defcnbe about the Pole of the Ecliptick, as 39'' to 
40 , 4 - The half of this k the Angle A C B_'(as repre- 
fented 
