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| Etymology of night from Varro | 37. a | Onias the high priest | 79. c |
| What is the end of night | 25. c | Fourfold mode of divine operation | |
| Offspring of night | 25. d | 2. a | |
| Use of night | 36. d | Various opinion on the creation of the world | 34. c |
| Noah | 28. c & 74. c | False opinion on the advent of the Lord | 94. c |
| When Noah went out of the ark | 75. a | Triple opinion on the advent of the Lord | 95. b |
| Nones a Roman date marker | 42. c & 26. & 34. a | The Milky Way signifies through the transverse | |
| Notus south wind | 14. c | 44. d | |
| November | 41. d | Origen | 29. c |
| Month of new things | 28 b | History of Orontes | 32. a |
| Novatian heresy | 29. c | Origen | 82. a |
| Month of new things | 72. d & 28. b | Origen dies | 82. b |
| How night is made | 3. c | Origen's books against Celsus | 85. b |
| What night is | 25. c & 36. b | Orpheus | 23. d |
| Whence night is made | 20. a | Orion | 60. b |
| Night from the north | 34. c | Oretan people | 55. a |
| Night is the shadow of the earth | 37. a | Rising and setting of the twelve signs of the | |
| Night may be equal to the day | 59. b | zodiac | 24. d |
| Night from "to harm" original: "a nocendo" | 25. d & 36. b | Bones of Andrew and Luke translated | 29. d |
| Night is the shadow of the earth | 25. d | Signs in the zodiac | 33. b |
| Whence clouds and rains are | 16. b | Emperor Otho | 89. a |
| How clouds are made | 16. a | Othniel, first judge of Israel | 76. a |
| Numa added two months to Romulus's year | Otho III | 89. b | |
| 42. a & 41. d | Othniel | 28. d | |
| Numa Pompilius | 77. a & 27. a | Otho I | 89. a |
| Month of Numa | 45. a | Otho II | 89. b |
| Regular numbers for determining | Otho is excommunicated | 90. c | |
| what the moon is on the calends of months | 48. b | Oreas | 29. a |
| Various modes of counting | 31. d | Uzziah | 29. a |
| Mode of counting by ciphers | 32. a |
Large decorative initial O with floral/scrollwork patterns.
Octavian | 29. a
The octave in the scriptures | 96. c
October | 41. d
Heliacal setting | 6. d
Tides of the ocean occur according to the age and course of the moon | 17. c
Octavian Augustus | 80. b
What part of the sky is understood as setting according to Pliny | 13. b
Ahaziah | 9. a
Ogdoad the number eight | 66. b
Olympus original: "ὄλυμπος", whence it is said to be named among the Greeks | 3. b
Olympus, whence named | 13. d
Olympus near the moon | 13. b
Olympics first constituted | 74. b
Olympus | 13. b
Olympiads | 32. c
Onesicritus | 55. a
Palladius | 84. b
Panthemus | 81. d
Pantheon | 81. b
Pantheon converted into a temple of all saints | 85. c
Pandects of Jerome | 87. b
Where Paradise is and what it is | 2. d
Fountain of Paradise | 2. d
Rivers of Paradise | 2. d
XXXVII parallels on the earth | 21. b
Demonstration of the five parallels | 60. a
Segments of the world of the parallels | 57. b
Two thousand students killed in Paris | 91. d
Parts | 33. b
Days of Easter | 72. b
Easter signifies passage | 28. b
Easter returns on the same day after the nineteen-year cycle has elapsed | 28. b