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Art. XXV.— SCIENTIFIC INTELLIGENCE. 
I. NATURAL PHILOSOPHY. 
ASTRONOMY. 
1. Comet of Encke re-discovered in New South Wales .— On the 
2d of June 1822, Mr Rumker re-discovered in Gemini the pe- 
riodical comet of Encke, which has excited so much notice, and 
from which it appears, that the revolution of this comet in 1204 
days is put beyond a doubt. This comet was observed in 1786, 
1795, 1801, 1805, and 1818; and by a comparison of all these 
observations, he calculated two sets of elements, which repre- 
sented the observations within two minutes of a degree. In 
these elements, the revolution for 1819 was 1208,452 days, and 
1204,452, and half the greater axis 0.8472191 and 0.8474612. 
With these data, M. Encke computed ephemerides of the co- 
met for 1822. He announced that he had little hopes of its 
being seen in Europe in 1822, as before June it would be ex- 
tremely faint, and always near the horizon, and in the month 
of June it would set at the same time with the sun. He added, 
however, “ that in south latitude 84°, the comet , in the beginning 
of June , would be elevated 24° above the horizon at sunset, and 
would then be as bright as a star of the fourth magnitude. Our 
readers cannot fail to remark the singularity of the circumstance, 
that M. Rumker, who accompanied Sir Thomas Brisbane to 
New South Wales, should have discovered this comet on the 2d 
June 1822, at Paramatta, in 88° 48' 45" of South latitude.-^- 
See Zaclfs Correspond. Astron ., vol. viii. call. 1., and Bibl Uni - 
verselle , Mars 1828, p. 178. 
2. Errors of the Lunar Tables from 1788 to 1821. — The 
following are the results of the comparison of the different Lu- 
nar Tables with 4068 observations, as ordered by the Board of 
Longitude ; 
VOL. ix. no. 17. JULY 1828, 
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