on, 157 atmosphere of the, 167 cusps of the, 174 diameter of the, 158 distance of the, 158 eclipses of the, 195 harvest, 177 irregularities of the, 186 librations of the, 179 light of the, 158 mountains in the, 159 nodes of the, 173 phases of the, 174 revolutions of the, 178-182 scenery of the, 163 telescopic appearance of the, 158 volcanoes in the, 166 volume of the, 158 Motion, laws of, 126 Motions of the planets, 291 Mural circle, 54 N. Nadir, 20 Nature of the stars, 390 NebulÆ, 377 New planets, 286 distances of, 288 origin of, 289 periods of, 288 size of, 289 New style, 66 Newton, 16, 143 O. Oblique sphere, 84 Obliquity of the ecliptic, 115 effect of, on the Seasons, 123 how found, 117 Observatory, 42 Greenwich, 42-48 Tycho's, 42 Old style, 66 Ophiucus, 372 Opposition, 200 Orion, 375 Orreries, 112, 292 P. Pallas, 287 Parallactic arc, 91 Parallax, 90, 389 annual, 387 horizontal, 93 how found, 94 Parallel sphere, 84 Parallels of latitude, 24 Pegasus, 373 Pendulum, 79 Perigee, 187 Periodical inequalities, |
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