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.
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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