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| Aoth | 76. a & 28. d |
| Apamia | 79. b |
| Appollinaris | 81. c |
| Appius Claudius | 79. b |
| April | 26. b & 41. c |
| April, whence named | 26. c |
| April, why called the month of Venus | 42. b |
| Boundaries of Africa | 23. d |
| Aparctias North wind | 14. c |
| Apeliotes East wind | 14. c |
| Apuleius on divination | 24. c |
| Apocalypse concerning the Antichrist | 95. b |
| Water, the beginning of all things | 17. b |
| Water is heavier than air, by how much water itself is lighter than earth | 36. b |
| Water is round | 19. c |
| What the waters that are above the heavens are | 4. d |
| Why icy waters are in the heavens | 4. c |
| Aquarius Water-bearer | 10. c |
| Why Aquarius is headlong | 45. a |
| Two species of waters | 17. b |
| Aquilo North wind | 14. c |
| Archelaus | 82. c |
| Arcturus | 60. b |
| Aristotle on the Euripus the strait between Euboea and Boeotia | 18. b |
| Aristotle: he criticizes Anaxagoras | 5. a |
| Aristotle | 29. a |
| Aristides | 81. b |
| Aries Ram | 10. c |
| Why the Phrixean Aries reference to the Golden Fleece myth | 44. d |
| A quarter part of Aries according to the Philosophers | 35. c |
| Armenians become Christians | 19. d |
| Arnulf, son of Carloman, King of Germany | 89. a |
| The cold star of Arcturus | 59. b |
| Arcadians, the first of mortals | 62. c |
| Archelaus, son of Herod, exults | 80. c |
| Arnobius the rhetorician | 85. b |
| Aristobulus, one of the 70 translators, on Easter | 54. a |
| Aristobulus | 79. d |
| Arphaxad | 71. a |
| Arses, son of Ochus | 79. a |
| Artaxerxes Memnon | 79. a |
| Artaxerxes | 78. d & 29. a |
| Artaxerxes Ochus | 79. a |
| Artabanus | 29. a |
| An article among arithmeticians | 31. d |
| The As a unit of weight or currency and its parts | 33. d & 35. d |
| Asa | 29. a |
| The As and its parts in Bede are corrupt | 47. b |
33. ch. 4
| Ascii people who cast no shadow at noon in the tropics | 54. d |
| Asareas | 77. a |
| Boundaries of Asia | 23. d |
| Assuerus, so called by the Jews | 79. a |
| Athaliah | 77. a |
| Athanasius, received in hospitality by Maximinus, Bishop of Trier | 85. b |
| Athenodorus | 82. a |
| Months of the Athenians | 41. a |
| Atom | 31. b |
| Augustine’s opinion on the first day of creation | 34. c |
| Augustine | 79. d |
| Augustus | 41. d |
| August, formerly Sextilis | 26. c |
| Augustine, Bishop of Hippo | 84. b |
| Bones of Augustine | 87. b |
| Augustus wages war with Antony | 80. b |
| Aurelius Antoninus | 29. c |
| Aurelius Alexander, Emperor | 82. a |
| Auster South wind | 14. c |
| Aurelian, Emperor | 82. c |
| Southern circle | 4. d |
| Birds of the heaven | 95. c |
| Autumn is dry and cold | 60. b |
| Autumn | 27. a |
| When autumn begins | 60. d |
| Avitus | 84. a |
| Azariah | 77. b |
| Days of Unleavened Bread | 72. b |
| Unleavened bread mystically | 72. d |
| Babylon is founded | 28. d |
| Baldwin, King of Jerusalem | 90. a |
| Pachomius wrote at the dictation of an angel | 65. b |
| Bede the monk | 67. b |
| Bede’s writing on the Reckoning of Time | 30. a |
| Bede refutes Victorius | 68. d |
| Bede to Wihtred the priest | 97. a |
| Bede the Englishman | 43. c |
| Bede took his work from C. Pliny | 1. d |
| Bede, a tolerable versifier | 2. b |
| Bede’s homeland | 52. d |
| Why Bede’s computation is less by nineteen years | 80. c |
| Bede to Heanfrith | 101. b |
| Bede’s doubt regarding the monthly ordering of the Hebrews | 39. d |
| Trojan War | 28. d |