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VII. ObJ'ervations of a new variable Star . In a Letter from 
Edward Pigott, Efq. to Sir H. C. Englefield, Bart. F. R. S. 
and FI. S . 
©EAR SIR, 
F OR fome years pad: I have been employed in verifying 
all the dars fufpe&ed to be variable, in order that here- 
after we may know with certainty what to depend upon. This 
undertaking, which is nearly completed, has already proved 
of ufe in dete&ing many midakes, and producing fome difco- 
veries ; among which, the following is one of the mod im- 
portant. September 10, 1784, I hrd perceived a change in 
the brightnefs of the dar y\ Antinoi, and by a feries of obfer- 
vations made ever fince, I find it fubjedt to a variation very 
dmilar to that of Algol, though not exactly the fapae in any 
one particular. 
71 Antinoi, when blighted, is of the third or fourth magni- 
tude, being between S and (3 Aquilas ; and at its lead bright- 
nefs of the fourth or fifth magnitude, it then being between 
that of ; Antinoi and p Aquilse ; therefore, its greated varia- 
tion in brightnefs may be called about one magnitude ; and the 
changes it undergoes, though probably not nicely afcertained 
from fo few obfer various, are nearly thefe ; 
Read December 23, 1784, 
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