114. New Method of determining the Longitude. 
“For the convenience of those who pursue these in- 
quiries, I have computed the following table of the value 
af.5- depending on the true motion of the moon in right as- 
mM 
cension in degrees during 24 solar hours, as shown by an 
ephemeris: which being multiplied by d, will give the 
value of ¢ required.”——p. 20. 
Argument=m=Moon’s motion in A. R, ina true solar day. 
Argument. - | Difference. | Argument. eA Difference. 1 
m 
10° 0’ | 2.4066| 13° O’ | 1.8513 
10 30 |2.2921/ “1072 | 13 30 |1.7827| “pega 
ri «60 | 2.4879 “0951 14. DO 11.4130 0592 
11 30 | 2.0928 (0873 14 30 | 1.6598 0554 
12 0 |2.0055) ° 02 15 0 41.6044 “0517 
12 30 | 1.9253 0740 1§.30 | 1.5427 “0485 
13:0: )38543K.- 16 0 | 1.5042 zs 
M. Nicolai hints that the formula proposed by Mr. Bai- 
ly is ing more than this indirect method in another 
dress, and suggests that it is to be used with caution in cer- 
i ses. We think the latter gentlemanhas shown that 
M. Nicolai is mistaken; but as we have not seen the pa- 
per of M. Nicolai referred to, we shall not attempt to take 
up the subject. Nor can we for want of room notice sev- 
eral other things in Mr. Baily’s paper that are of impor- 
tance in relation to the subject under consideration ; partic- 
ularly his remarks in regard to those observations made 
with a transit instrument containing a number of cross 
wires. We have already extended this notice to a great- 
er length than we should have done, had we not felt much 
interested in the paper, and very desirous to have the 
method it proposes immediately adopted by observers in 
this country, where so few places have their longitude well 
settled. Jt was originally read before the Astronomical 
Society of London and will appear in the second volume o 
their memoirs ; and Mr. Baily has obtained ‘‘ an impres- 
sion of some separate copies, with an intention of distribu- 
ting them in various parts of the world, in order to procure 
a fair and general trial of the method therein proposed.” 
