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• 51. The universe
• 52. Galaxy
• 53. General notions of astronomy
• 54. Cosmology and cosmogony
• 55. The terrestrial sphere and the celestial sphere
• 56. Spherical coordinate systems
• 57. Spherical triangle of geometric position and spherical trigonometry
• 58. The diurnal motion of the celestial sphere
• 59. The diurnal motion of the celestial sphere for an observer at a certain latitude

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• 60. Constellations
• 61. The main stars
• 62. Solar system
• 63. The law of universal attraction. Kepler's laws I
• 64. The law of universal attraction. Kepler's laws II
• 65. Sun
• 66. The apparent annual movement of the sun
• 67. The apparent annual movement of the sun
• 68. The celestial sphere
• 69. Solar eclipses

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• 70. Planets
• 71. Apparent Motion of the Planets I
• 72. Apparent Motion of the Planets II
• 73. Spherical coordinates and the spherical triangle of position
• 74. Apparent motion of the inner planets I
• 75. Apparent motion of the inner planets II
• 76. Apparent motion of the higher planets I
• 77. Apparent motion of the higher planets II
• 78. The appearance of the celestial vault
• 79. The moon

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• 80. The phases of the moon I