The author of the Astronomicon Libri proposes to show how astrology, the methods of which he explains, is part of a general conception of the universe, the unity and divinity of which it demonstrates. The presentation of the astrological system, which is the main part of Books II to V, contains many textual difficulties. Nevertheless, the traditional divisions of ancient astrology and the use of methods similar to those employed by other astrologers can be seen in the Astronomicon ,· the absence of a chapter dealing with phnetary influences is certainly due to the fact that the poem is mutilated or incomplete. In this presentation there are clear choices, either the poet' s own choices or those of the sources on which this synthesis between...