Ptolemaeus Arabus et Latinus

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Work B.9

Liber de iudiciis planetarum

A brief account of the domiciles, exaltations, nature, influence and revolution periods of the planets, found as a stand-alone text attributed to Ptolemy in the two manuscripts listed below, both copied in the first half of the fifteenth century. This work in fact first occurs, with attribution to Ptolemy, in two encyclopedias composed c. 1230-1240: Bartholomew the Englishman, De proprietatibus rerum VIII (where it is disseminated in various places) and Arnold of Saxony, De floribus rerum naturalium I.2. The work is also found in four fifteenth-century manuscripts, where it is inserted into Michael Scot’s Liber de signis et imaginibus celi (Florence, BNC, Magliabech. XXII.22, f. 41va-41vb; London, BL, Addit. 41600, f. 59vb-60rb; Milan, BA, I. 90 sup., f. 245v-246r; Venice, BNM, lat. VIII.21 (2685), f. 27vb-28rb). The origin of this work and its attribution to Ptolemy are as yet unclear.


‘(ed. Draelants/Frunzeanu) In libro de iudiciis planetarum Ptolomeus. Saturnus. Sub Saturno sunt hec signa Capricornus et Aquarius et sunt eius domus. Regnat in Libra et in Ariete — (Luna) complet cursum suum in viginto octo diebus.’


I. Draelants, E. Frunzeanu, ‘Sur les traces du De motibus / iudiciis planetarum attribué à Ptolémée’, Early Science and Medicine 16 (2011), 571-599.

Modern ed.

Draelants/Frunzeanu, 595-599 (from all known MSS).


Basel, UB, O.IV.4, s. XV, f. 11v-12rImages

Lyon, BM, 172, s. XV, f. 52r-52v