This historic book may have numerous typos and missing text.
Purchasers can usually download a free scanned copy of the original
book (without typos) from the publisher. Not indexed. Not
illustrated. 1845 edition. Excerpt: ...of the moon's node from that
of the moon itself, is 5.9356, and the corresponding equation,
obtained from table 17th, is--.0233. This applied, leaves 66.9131
for the moon's true longitude from the mean vernal equinox. CHAPTER
VIII. LUNAR, OK MENSTRUAL EQUATION OP THE SUNS LONGITUDE AND
NUTATION. 67. It was observed in article 2d, 'that any motion or
change of motion in the earth, produced apparently a precisely
similar one in the sun. Now, the earth, like the moon, revolves
round the common centre of gravity of the two, and is, therefore,
subject to inequalities in this motion, the same in kind as those
we have been considering in that of the moon, though far less in
degree, owing to the earth's greater weight, and consequently close
proximity to the centre of gravity. These inequalities, small in
themselves, are rendered vastly smaller in their effect upon the
sun's apparent motion, by reason of the great distance of the
latter. Fig. 14. Let S (Fig. 14) represent the sun, ABF the earth,
E its centre, M the moon, and C the common centre of gravity
between the earth and moon, about which both revolve. The distance
from E to C is not far from 2970 miles, or about three-fourths of
the earth's radius. It is manifest that the longitude of the sun,
as seen from E, will differ from its longitude as seen from C, by
the angle CSE. When the angle MES is either 0 or 180, the angle CSE
will disappear, and when it is of any other size, the latter angle
can be calculated: for, in the triangle CES, the two sides, CS and
CE, and the angle CES are known. We assume here, that E revolves in
a circle round C, keeping CE of uniform length. It is plain from
the diagram, that if the longitude of the moon exceeds that of the
sun, the latter will be increased by..
|Country of origin:
• James Henry Coffin
||246 x 189 x 2mm (L x W x T)
||Paperback - Trade
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