! 
114 | Catalogue of xadiacal Stars. 
On the 7th, I could still see the voleano, and the occasional 
star like appearance; but I de not think it was sufficiently per- 
ceptible to have been discovered by a person ignorant of its pre- 
cise situation. T am inclined however to think, that the diffi- 
culty of seeing it is rather to be attributed to the increased light 
of the moon, than to the diminished action of the volcano. 
I have the honour to be, dear sir, &c. 
To Sir H. Davy, Bari. P.R.S. &c. Henry Kater. 
P.S. Since the preceding letter was written, I have ascertained 
that the spot in which I observed the volcanic appearance is that 
named Aristarchus. This spot was particularly examined by He- 
velius, who calls it Mons Porphyrites, and who considers it to be 
volcanic. If his drawings are to be relied upon, it has under- 
gone a considerable change in its appearance since his time. 
Sir William Herschel has recorded in the Philosophical Trans- 
actions an observation of three voleanoes, which he perceived in 
the moon, April 19, 1787, at 10° 36™, sidereal time. One of 
these, which he says showed *‘ an actual eruption of fire or lu- 
minous matter,’ was distant from the northern limb of the 
moon 3’ 57-3, the diameter of the burning part being not less 
than 3”, 1 find that this observation was made about 9 o’clock 
in the evening, when the moon was not quite two days old; and 
from the situation of the spot described by Sir William Herschel; 
I have no doubt of its being the same that I have noticed. 
XXVII. The first Portion of a Catalogue of 1800 zodiacal Stars, 
for the Epoch of January 1, 1800; “from the Works of Piazzi, 
Bons, and others, with ‘liste ative Notes. Selected and ar- 
ranged by a Member of the Astronomical Society of London. 
Ix the present and five following portions, it is intended to offer 
to the amateurs of Astronomy, a Catalogue of Stars lying within 
10° on either side of the Ecliptic; arranged in the order of their 
passing the meridian, and containing not only the mean Right 
Ascensions and Declinations, but as many other accurate and use- 
ful particulars, as the compiler’s materials, and the limits of an 
octavo page, will permit. 
By referring to the notice inserted p. 394 of the preceding » 
volume, it will be seen that a general catalogue of stars is an- 
nounced, comprising in number about 4000, and extending over 
that part of the heavens which is visible to British observers. 
This extent it was intended to divide into four districts, and the 
most natural arrangement would be to commence with that which 
is constantly above our horizon. The slow progress, however, 
which 
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