Abu Ma'shar, 805 or 6-886. Introductorium in astronomiam Albumasaris
Albalachi : octo continens libros partiales. Venetijs, Erhard Ratdolt,
1489. Editio princeps, Gothic letter, 40 lines, 70 leaves, 43 woodcuts, 3
woodcut diagrams. Bound in vellum.
Albumasar was a noted ninth century Baghdad astrologer. His book was used
in the Middle Ages as the most important source for information on the ebb
an flow of tides and the effect of the moon on tides. Erhard Ratdolt, ca.
1477-ca. 1527, was the earliest printer to specialize in secular books,
chiefly astronomy, astrology and mathematics. He was the first to print