From the National Intelligencer.

ASTRONOMY.
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That science which, of all others, proves most
emphatically the weakness of mans physical
power, and the strength and sublimity Of his intel
leclual nature, reveals from time to time the won
ders spread through the ilnitable fields of space.
Since the 18th March, 1871, when Herschel, the
elder, discovered the Uranus, until the 9th De-
cember, l645, whcn as stated in the National In
teligencer of february 2, 1946, Hencke discov-
cred Astrea six primary planets have been discov-
cred. ..


The statement in the 1ntelligcncer docs not con-
tain the mean distance OF Astrea from the Sun,
and, of course the relative position Of the planet
Happily, the periodic time, 1865 days, was CIV
en-, by which the third law of Kepler enables us
to determine the mean distance. This operation
1 have performed, assuming the mean distance of
the earth at ninety-fSe million miles, and the
year at 365 Ia days; and tested the result BY the
orbits of Mars and Jupiter. The calculations
are general but suitable for The purpose. The
planetary orbits stand in the following order:


Planets Mean distance Mean sidereal Pe-