114 JVew Method of determining the Longitude. 



" For the convenience of those who pursue these in- 

 quiries, I have computed the following table of the value 



of — depending on the true motion of the moon in right as- 

 m 



cension in degrees during 24 solar hours, as shown by an 



ephemeris : which being multiplied by f?, will give the 



value of e required '' — p. 20» 



t^rgument=m=Moon^ s motion in A. R, in a true solar day. 



Difference. 



Differet^ce. 



.1145 

 .1042 

 .0951 

 .0873 

 .0802 

 .0740 



.0686 

 .0637 

 .0592 

 .0554 

 .0517 

 .0485 



M Nicolai hints that the formula proposed by Mr. Dai- 

 ly is nothing more than this indirect method in another 

 dress, and suggests that it is to be used with caution in cer- 

 tain cases. We think the latter gentleman has 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. It was originally read before the Astronomical 

 Society of London and will appear in the second volume of 

 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." 



