20 ON THE LONGITUDE OF THE SYDNEY OBSERVATORY, 
twenty-three determinations, together with the resulting indiy 
corrections of the longitude of my pastor: * Tt will be 
that the mean of the twenty-three corrections is + 611s, am 
have the derivation of the longitude of the Sydney Ob 
as follows :— 
H. 
Assumed longitude of my a see EN 9 
Correction from the occultati 
Concluded longitude of my Observatory .............++++« 
Longitude of the Sydney Observatory east of mine . 
Concluded longitude of the Sydney Observatory ...... 
T observe in the introduction to the Melbourne ob 
1871-5, recently issued from the press, that a comparison 0 
errors of the moon’s right ascension derived from 
bourne observations in 1874 and 1875, with the erre 
we om 10h. _ 50° Phra E,, a the lo 
atory. erie 
minations in 1803 and 1871-234 the ‘value 10h. 4m 
t between three 
