428 Mr. Goldingham on the geographical situation of 
Madras, that the tables about that period gave 2' 55", 5 too 
much. If, therefore, this quantity be subtracted from the 
result, the longitude will be only 72 0 54/ 52" E. 
More than 30 eclipses of the satellites of Jupiter, immersions 
as well as emersions, were also observed ; and by allowing 
for the difference of the tables at that period by comparisons 
with Greenwich observations, the longitude of the place of 
observations, by the mean of the first and second satellites, 
was 72 0 53' 2 6". 
Also, by a very good chronometer, the rate of which I 
found before leaving Bombay, and after my arrival at 
Madras* (having been about 16 days on the passage), the 
difference of the longitude between the place of observation 
at Bombay and the Madras Observatory is . 7 0 24/ 12" 
This gives for the longitude of the former 7° 53' 9” 
The longitude of Bombay (place of observation) by 
the lunar observations corrected . 72 54 52 
By eclipses of the satellites of Jupiter, Tables 
corrected . . . . 7 2 53 26 
By the difference of longitude by the chronometer 72 53 9 
Mean 72 53 49 
But the place of observation was 54 seconds of a degree 
west of Bombay Church, and 13 east of the Light House ; 
therefore the longitude of the Church, by these observations, 
is 72 0 54' 43", and of the Light House, 72° 53' 36" east of 
Greenwich. -f 
* Rate on quitting Bombay + 4o",43 
On my arrival at Madras -f 40, 34. 
t The difference of meridians between Madras and Bombay Churches, according 
to these deductions, is 7 0 24' 59". 
