from an Eclipfe of the Sun* ^ 
The obfervations of Loampit-Hill, Greenwich, and Oxford,, 
as they ferveforthe balls of all my calculations, I have calcu- 
lated them two different ways, viz. by the method of paral- 
laCtic angles, and by the method of the nonagefimal, and the 
refults agreed together within a few tenths of a fecond. By 
thefe two different methods I have alfo calculated the obferva* 
tions of Vienna, Berlin, and Viviers, in order to fhew, that 
the different latitudes of the moon, given by the various obfer- 
vations, were not owing to any error in my calculations. For 
thefe places, in which both the beginning and the end of the 
eclipfe had been obferved, I have deduced the time of con^ 
junction from the two phafes conjointly, which have alfo given 
the duration of the eclipfe,. which cannot be obtained from a 
lingle obfervation. 
The error of the tables which refults from the obfervation at 
Greenwich is +26" in longitude, and +11", 5 in latitude, at 
20 h. 58' 47 // ?3 of apparent time, taking for the longitude of 
the fun 2 s. 14 0 i 6 / 54 // ,7, as I deduce from the Nautical 
Almanack, and that of the moon at the fame time to be greater 
than the fun by 26", as deduced from the fame Almanack. | 
fuppofe alfo the horary motion of the moon in the ecliptic, by 
taking it an half hour before and after the conjunction, to be 
36' 52 // d-Q // ,6 for the hour following the conjunction, and 
— for the hour preceding the conjunction ; the moon’s 
horary motion in latitude is 3^ 24", 3 ; the horizontal parallax of 
the moon minus that of the fun at Greenwich, to be 60' 14 / ,4 
1 
for the commencement of the eclipfe, and 6 o / for the 
end; the fun’s diameter 3F 34", 6, lefs by 3" than that given 
in the Almanack, according to the correction which you have 
found neceffary to be made ; the moon’s diameter I have ftated 
as in the Almanack. In the opinion of M. de la Lan de, 
I 2 fome 
