O. Obliquity of the ecliptic, [74]. Occultations of Jupiter’s Satellites, [121]. Olbers, W., [112], [174]. Opposition of Planets, [13]. Orbits of the Planets, [9], [10]; of Comets, [161].
P. Pallas (Minor Planet), [112], [113], [114]. Parabola, [162]. Penumbra of a Sun-spot, [22]. Perihelion, [11], [102]. Periodic Comets, [162], [170]. Perturbations of Uranus by Neptune, [145]. Phases of an inferior Planet, [15]; of a superior Planet, [16]; of Mars, [100]; of Jupiter, [115]. Piazzi, G., [111]. Planets, classification of, [7]; comparative sizes of, [11]; movements of, [10]. Plutarch, [71]. Poles of Mars, snow at, [104]. Primary Planets, [7]. Ptolemaic System, [72].
Q. Quadrature of a Planet, [16]. Quenisset’s Comet, 1893, [156].
R. Rays of the Sun, [20]. Refraction, [77]; effect of, [77]. Red spot on Jupiter, [118]. Resisting Medium, [175]. Retrograde motion of a Planet, [15]. “Rice grains” on the Sun, [39], [40]. Rings of Saturn, [128]. Rosse, Earl of, [93]. Rotation of the Sun, [24], [28]; of the planets, [17], [183]. Rotundity of the Earth, [76].
S. Satellites of Mars, [16], [184]; of Jupiter, [16], [184]; of Saturn, [16], [185]; of Uranus, [16], [185]; of Neptune, [16], [185]. Saturn, [122]. Sawerthal’s Comet, [165]. Schiaparelli, J. V., [59], [62], [63], [106]. Schmidt, J. F. F., [96]. Schröter, J. J., [58], [62], [63]. Schwabe’s observations of Sun spots, [46]. Seas, Lunar, [94]. Seasons on the Earth, [54], [74]. Secchi, A., [28], [35], [42], [50], [84], [86], [106]. Secondary Planets, [8]. Shakespeare, citations from, [152]. Smyth, C. P., [92]. Snow on Venus, [66]; on Mars, [104]; doubtful on Saturn, [123]. Solstices, [74]. Spherical form of the Earth, [70]. Spörer, [46], [50]. Spots on the Sun, [21], [118]; on Venus, [61]; on Jupiter, [117]; on Saturn, [123]. Stewart, B., [52], [56]. Struve, O., [134], [142]. Sun, [18], [183]. Superior Planets, [8]; movements of, [15]. Surfaces of the Sun and Planets, [183]. Swift’s Comet, [168]. Systems of the Universe, [72].
T. Tables of the Major Planets, [183]. Tails of Comets, [154]. Temple’s Periodical Comets, [167]. Terminator of the Moon, [90]. Thomson’s Seasons cited, [153]. Tides, [98]. Total Eclipses of the Sun, [57]. Transits of inferior Planets, [13], [25], [65]. Trouvelot, [133]. Turtle’s Periodical Comet, [167], [168]. Twilight, [80]. Twinkling, [83]. Tycho (Lunar Mountains), [94]. Tycho Brahe, [73]. Tychonic System, [73].
U. Umbra of a Sun-spot, [22]. Uranus, [138]; the influence of Neptune on, [143].
V. Velocity of the planets, [183]. Venus, [61]; phases of, [15]; its influence on Sun-spots, [51], [52], [53]. Vernal Equinox, [74]. Vesta (minor planet), [112], [113]. Virgil, citation from, [50]. Volume of the Sun, [20]; of the Planets, [183].
W. Weather influences ascribed to the Sun, [44]; to the Moon, [98]. “Willow leaves” on the Sun, [39], [40]. Wilson’s theory of Sun-spots, [32]. Winnecke’s Periodical Comet, [167]. Wolf, R., observer of Sun-spots, [45], [48]. Wolf’s Periodical Comet, [168].
Y. Young, C. A., [131].