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earth, 50. Sidereal time reck-
oned by the diurnal motion of
the, 59. Visible by day, 63.
Fixed and erratic, 161. Their
relative magnitude; infinite
number, 373. Their distribution
in the heavens, 375. Their
distances, 376. The centers of
planetary systems, 380. Period-
ical, 381. Temporary, 383.
Double, 385. Binary, 390. Their
orbits elliptic, 391. Their colours,
394. Their proper motions, 395.
Clusters of, 398. Globular clus-
ters of, 400. Irregular clusters
of, 402. Nebulous, 404.
Sun, apparent motion of the, not
uniform, 184. Its apparent dia-
meter also variable, 185.
Its
orbit not circular, but elliptical,
186. Variation of its distance,
187. Its apparent annual mo-
tion, 188. Parallax of, 189. Its
distance and magnitude, 192.
Dimensions and rotation of, 193.
Mean and true longitude of, 202.
Equation of its center, 203. Phy-
sical constitution of, 207. Den-
sity of; force of gravity on its
surface, 239. The disturbing
effect of, on the moon's motion,
240.

T.

Table, exhibiting degrees in dif
ferent latitudes, expressed in
British standard feet, as result-
ing from actual measurement,
113.
Telescope, 85. Application of, the
grand source of all the precision
of modern astronomy, 86. Dif.

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THE END.

LONDON:

Printed by A. SPOTTISWOODE,
New-Street-Square.

1280 6

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JOHN G. WOLBACH LIBRARY
HARVARD COLLEGE OBSERVATORY
60 GARDEN STREET

CAMBRIDGE, MASS. 02138

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