4-6 •!• Astronomical Society. 



left hand page is confined to the light ascensions^ the right 

 hand page to the declinations. Col. 1, on the left hand, ex- 

 hibits the numbers of the stars. Col. 2, the names ,- to which 

 are prefixed Flamsteed's numbers, and the letters of the alpha- 

 bet, by which they are usually distinguished. Col. 3 denotes 

 the magnitudes of the stars. Col. 4, the right ascensions, in 

 time, for Jan. 1, 1830. Col. 5, the annual precession in time. 

 The remaining columns contain the logs, of a, b, c, rf, each 

 previously divided by 15 to reduce them to time. 



On the right hand page. Col. 1 is the same as Col. 1 on the 

 left hand. Col. 2 exhibits the declinations of the stars for 

 Jan. 1, 1830. Col. 3 the annual precession. Cols. 4, 5, 6, 7, the 

 values of a', b', c\ d'. Tlien there are two columns headed B 

 and P, denoting the corresponding numbers in the catalogues 

 of Bessel and Piazzi respectively ; while the last column is re- 

 served for those which are to be found in Hevelius, Lacaille, 

 Mayer, Zach, &c. 



There are several subsidiary tables, which Mr. Baily also 

 succinctly explains ; and he further developes the pi-inciples 

 of correction for proper 7notion, &c. when necessary. 



The general rule for the use of the tables is this : viz. Take 

 out from the general catalogue, and opposite the given star, 

 the logarithms of a, b, c, d, and a, b', c, d', with their proper 

 signs; and from the subsidiary Tables I. and II. opposite the 

 given day, the logs, of A, B, C, D, with their proper signs ; 

 ■which must be written down under the preceding logarithms : 

 then add each pair A, a; B, b, &c. ; together ; and take out 

 respectively the natural numbers corresponding to the sum of 

 the two logarithms ; and (observing that the signs only affect 

 the resulting natural numbers) incorporate them by addition 

 or subtraction accordingly ; the amount will be the total cor- 

 rection required ; that arising from a, b, c, d, being the cor- 

 rection in /R ; that from a', b', c', d', the correction in decli- 

 nation. Thus, the whole of the corrections are obtained with- 

 out a reference to any other work, except a small table of 

 logarithms. 



The tables are arranged to mea7i solar time, which, it is 

 presumed, will extend their utility. And it may be observed, 

 that, by way of artificial memory, to facilitate the recollection 

 of the precise subject to which each column refers (as in B 

 for Bessel, P for Piazzi, already mentioned), Mr. Baily has 

 made A B represent the quantity by which the Aberration is 

 determined, C the quantity by which the preCession is deter- 

 mined, and D that by which the Deviation (or Ntitntion) is 

 determined. These contrivances, though avowedly subordi- 

 nate, will not be despised by those who know how much the 



pursuits 



