of a new Variable Star . 155 
their change of position occafioned by the earth's diurnal 
motion, and that particularly in ftars of a great altitude. 
The magnitudes of the ftars, to which (3 Lyrae was com- 
pared during the progrefs of its variation, are as follows. 
(3 Cygni and y Lyras of the third magnitude ; | and 9 Herculis 
of between the fourth and third magnitude ; 0 Herculis is 
fomething lefs than a ftar of the fourth magnitude*; g", jc, and 
< 3 * Lyras are ftars of between the fourth and fifth magnitude, if 
not nearer the fifth. The relative brightnefs of thele ftars 
follows the order in which they are fet down. 
1 
Qbfervations of the brightnefs and magnitude of j 3 Lyras. 
1784, Sept. 10. At 1 1 h. =*=, much lefs than y Lyrae ; 
nearly equal to, if not rather brighter than k, and 8 Lyras, 
and not fo bright as 9 , and 0 Herculis ; between the fourth 
and fifth magnitude. 
Sept. 11. At 8| h. nearly the fame as it was laft night, if 
not brighter ; indifferent obfervation. 
Sept. 12. At 8| h. and 9 h. between the third and fourth 
magnitude ; lefs than y Lyras, brighter than 9 , £, and 0 Her- 
culis, and much brighter than f, *, and 8 Lyras. Mr. E. 
Pi got t agrees with me nearly. 
Sept. 13, 15, 1 8, 19, and 20. It was at or near its greateft 
brightnefs. 
Sept. 23. At 7 1 h. it was nearly equal to £*, a, and £ Lyrre, 
and much lefs than £, 9 , and 0 Herculis. 
At 1 of h. the air being extremely clear, I compared it more 
attentively to the neighbouring ftars, and found it as follows : 
rather a little brighter than 8 > a little lefs than £*, and rather 
X 2 lefs 
