Columbia subject headings:
Astronomy, Medieval.
Jewish astrology.
Jewish astronomy.
Levi ben Gershom, 1288-1344.
Harvard subject headings:
Astrology--Early works to 1800
Levi ben Gershom, 1288-1344
Muris, Johannes de, approximately 1300-approximately 1350.
Princeton subject headings:
Astronomy, Medieval.
Jewish astrology.
Jewish astronomy.
Levi ben Gershom, 1288-1344.