268 Geographical Position of the 
at command, will fix the position with more decided 
accuracy. 
he 
Moon CuULMINATING STAR OBSERVATIONS. 
These observations were made in the years 1848, 1844, 
and 1846. In order to obtain the corresponding obser- 
vations made at the principal Observatories in England, 
I forwarded them, when completed, to my friend Captain 
Shadwell, R.N., who kindly undertook their reduction, and 
subsequently drew up a paper upon the Jongitude of the 
Hobart Town Observatory, deduced from these observations, 
for the Astronomical Society. It is matter of regret to me, 
that out of 41 sets of both limbs of the Moon, observed 
at Hobart Town, so few corresponding observations were 
obtained*in England, particularly of the Moon’s second 
limb.., 
In the introductory remarks, Captain Shadwell observes : 
“In taking the means for the final results, it is assumed 
“that the value of each individual result is directly pro- 
“portional to the square root of the number of stars 
“ observed with the Moon; and also to the velocity of the 
“ Moon’s motion in right ascension in an hour of longitude, 
‘‘in the interval of her transits over the two meridians, 
** 140s. is assumed arbitrarily as the mean value of this 
“hourly motion, which shall be represented by unity, and 
“if 2 be the actual number of seconds in the Moon’s 
“ actual motion, and M the number of stars observed with 
“the Moon, to find the weight in the ‘annexed columns, 
“‘ we have 
1 
IVES eee 5 
— pov 
“ the sum of the products of the individual results of each 
“ observation, multiplied into its weight, divided by the 
