117

34. Apparent Size of the Sun from various Planets 118

35. Comparative Sizes of the Planets 119

36. Illustration of the Moon's Motion 130

37. Drawing an Ellipse 137

38. Varying Velocity of Elliptic Motion 140

39. Equal Areas in Equal Times 141

40. Transit of the Planet of Romance 153

41. Variations in Phase and apparent Size of Mercury 160

42. Mercury as a Crescent 161

43. Venus, May 29, 1889 170

44. Different Aspects of Venus in the Telescope 171

45. Venus on the Sun at the Transit of 1874 177

46. Paths of Venus across the Sun in the Transits of 1874 and 1882 179

47. A Transit of Venus, as seen from Two Localities 183

48. Orbits of the Earth and of Mars 210

49. Apparent Movements of Mars in 1877 212

50. Relative Sizes of Mars and the Earth 216

51, 52. Drawings of Mars 217

53. Elevations and Depressions on the Terminator of Mars 217

54. The Southern Polar Cap on Mars 217

55. The Zone of Minor Planets between Mars and Jupiter 234

56. Relative Dimensions of Jupiter and the Earth 246

57-60. The Occultation of Jupiter 255

61. Jupiter and his Four Satellites 258

62. Disappearances of Jupiter's Satellites 259

63. Mode of Measuring the Velocity of Light 264

64. Saturn 270

65. Relative Sizes of Saturn and the Earth 273

66. Method of Measuring the Rotation of Saturn's Rings 288

67. Method of Measuring the Rotation of Saturn's Rings 289

68. Transit of Titan and its Shadow 295

69. Parabolic Path of a Comet 339

70. Orbit of Encke's Comet