Paper, 90 f., two hands (f. 1-4 and 47-90). One or several folia are missing between f. 35 and 36.

Astrology, astronomy and computus: ‘Sequuntur iudicia planetarum in signis cum unus fuerit electus super reliquis. Et primo de Saturno. Aries. Iupiter in Ariete siccitas modica et pluvia pauca…’ (1r-9r); ‘Scientia inveniendi dominum anni et iudicia de eodem. Sole ingrediente in primum punctum Arietis…’ (9r-10r); ‘Sequitur de natura stellarum et de motibus astrorum. In libro de celo et mundo secundum novam translationem Aristoteles. Stelle sunt ex materia corporis celi…’ (10v-11v); Ptolemaica (11v-12r); ‘Virtutes et complexiones signorum. Luna in unaquaque lunatione 12 signa pertransit sicut Sol in anno…’ (12r-14v); ‘Item si aliquam viam pergere cepis…’ (14v-15r); ‘Nascentia signorum. Aries est signum dans hominem esse mediocris stature…’ (15r-15v); diagram showing the aspects and note on essential dignities (15v); diagram: essential dignities of the planets in each of the 12 signs (16r); short astrological chapters ‘Triplicitates sic distinguuntur in omnia 3 signa que in natura…’ (16v-17r); ‘Sequitur quot horis unumquodque signum oritur. Signorum quedam oriuntur recte…’ (17r-17v); ‘Sequitur de horis planetarum. In hora Saturni malum est purgare splen…’ (17v-18r); ‘Item sequuntur alie electiones planetarum recepte de libro Ababule et de libro Albumasar. In hora Saturni non bibas medicinam nec incidas pannos…’ (18r-18v); ‘Sequitur de horis planetarum cuiuslibet diei specialiter. In die dominico prima hora est Solis. Si quis profectus fuerit…’ (18v-19r); ‘Regula de planetis homini. Si planetam hominis invenire velis, divide per 4 virorum nomina mulieris…’ (19r-19v); table and diagrams: planetary hours (19v); ‘Sequitur de significationibus planetarum in signis. Saturnus in Ariete pro lege populi et agris…’ (20r-25r); diagram: celestial circles, with note ‘Item notandum quod hii quinque circuli…’ (25v); ‘Sequuntur principia scientie astronomie. Summa principiorum et eorum que oportent presciri in noticiam scientie astronomie et ad librum Pthol<omei> Almagesti et ad intelligendum Tractatum de spera. Equator diei est circulus…’ (26r-31r, cf. MS Lyon, BM, 172, under Note); astronomical anthology ‘In libro Ciceronis Macrobius fontem celestis lucis Solem appellavit…’ (31v-32v); ‘Computus manualis. Compondium (!) computi manualis. Si nosse desideras…’ (33r-35r); notes of computus and astronomy (35r-35v); text on the constellations and lunar mansions missing the beginning (36r-39v); twelve astronomical and astrological diagrams (40r-40v); ‘Sequuntur iudicia de tonitruo. Ab oriente tonitruum per annum illum effusione sanguinis significat…’ (41r); ‘Planete regnantes in mensibus. In principio Ianuarii regnat Mars…’ (41r); Ptolemaica (41v); Revelatio Esdrae ‘Feria prima hyems bona, ver ventosum, estas sicca…’ (41v-42r); ‘Sequitur de naturis et significationibus planetarum. Septem planete sunt sidera errantia que moventur contraria celum…’ (42r-43r); ‘Stella Solis, scilicet dominica, habet numeros 24…’ (43r-43v); diagram showing the aspects (44r); ‘Modus inveniendi oppositionem Solis et Lune ac primam et secundam quadram Lune. Si oppositionem Solis et Lune…’ with eclipse table 1393-1609 (44r-46v); Alcabitius, Introductorius (47r-90v).

Bibl. Katalog der datierten Handschriften in der Schweiz in lateinischer Schrift vom Anfang des Mittelalters bis 1550, I: M. von Scarpatetti, Die Handschriften der Bibliothek von Aarau, Appenzell und Basel, Dietikon-Zürich, 1977, 221 (no. 613); I. Draelants, Un encyclopédiste méconnu du XIIIe siècle: Arnold de Saxe. Œuvres, sources et réception, PhD dissertation, Université of Louvain-la-Neuve, 2000, 2 vols, I, 95-99.