Catalogue of zodiacal Stars. 117 
10. Declination. This is taken from the same authority as 
the Right Ascension. Northeri declinations are considered pos?- 
tive, southern ones negative. The sign +- is uniformly omitted 
for the sake of distinctness. 
11. Annual Variation in Declination. This is to be applied 
(for a period after 1800) according to the algebraical effect of 
the two signs. The remark made under the ninth column, as 
to the numbers marked with an asderisk, applies also to this co- 
lumn. 
12. Approximate Latitude. It would have been highly de- 
sirable to have given the correct longitudes and latitudes of the 
zodiacal Stars, although these elements are of less importance 
than formerly, since the astronomical formula into which the 
positions of the stars enter, are now more frequently adapted to 
right ascension and declination. No catalogue however since 
that of Mayer, has been reduced to the ecliptic, if we except one 
of 600 principal stars, computed by M. Chabrol, inserted in the 
Connaissance des Tems, an xii., and thence copied into Rees’s 
Cyclopedia, art.  LoneitupE.”’ , Those therefore who desire 
to have the exact longitudes and latitudes must compute the same 
trigonometrically. The compiler has given the latitudes in de- 
grees and tenths, from Flamsteed and Mayer, or else as estimated 
by means of a 2]-inch globe; under the impression, that even 
in this rough manner they would assist the observer in selecting 
those stars, which at any particular period may be liable to oc- 
cultation or appulse by the moon or a planet. 
Lastly, The notes accompanying the present catalogue, are in 
part deduced from a comparison of the several authorities, and in 
part selected from the notes attached to the catalogues themselves. 
Assistance has likewise been derived from Sir W. Herschel’s valu- 
able papers in the Philosophical Transactions, and particularly 
from his catalogues of Comparative Brightness, contained in the 
volumes for 1796, 1797, and 1799. His descriptions of double 
stars are for the most part copied verbatim from the volumes for 
1782 and 1785. 
*,* The compiler begs to state, that he shall be happy, in the 
future portions of his undértaking, to adopt any improvements 
that may be suggested ; provided they do not interfere too much 
with the general plan, 
