Mr. Golding ham's Account , &c. 323 
The greater number of these eclipses were not visible at 
Greenwich, but have been found very useful, when corres- 
pondent observations have been taken in India. 
Persons not much in the habit of observing these eclipses, 
but desirous of obtaining as much correct information from 
their observations as possible, may find the following general 
remarks of use. 
A correct difference of longitude, it would appear, is not to 
be expected, by comparing the time of observation with that 
in the tables ; it therefore becomes necessary to have a cor- 
respondent observation to compare with, or some satisfactory 
observations taken under a known meridian, about the time ; 
from which the errors of the tables may be found. Corres- 
pondent observations, should, however, be obtained if pos- 
sible : but it must not be supposed, that even these will give 
a correct difference of longitude, unless observed at both 
places, under the like favourable circumstances, and with 
telescopes of the same powers. 
The air being clear ; the planet so high as to be out of the 
thick atmosphere, and to make the position easy ; the telescope 
sheltered from the wind, and steady ; neither moonlight nor 
twilight, and the satellite not near the body of the planet : 
An eclipse observed under such circumstances, will, I appre- 
hend, be as perfect as it well can be ; and a correspondent 
observation taken under the like circumstances, will give a 
correct difference of longitude of the two places, provided the 
eclipse be observed with telescopes of the same powers. 
Taking the eclipses in the following tables, observed under 
these favourable circumstances as the standard, and com- 
paring their results as given in the last column, with those 
T t 2 
