The Middle Dutch manuscript Vienna ÖNB 2818 contains a number of treatises on astrology, astronomy and medicine. One of the astronomical texts, a so-called 'perpetual almanac', forms the subject of this article. This almanac can be divided into two sections, a textual part and one with a series of tables. The first part explains how fast the planets move, how they can be recognized and how the tables must be used. It also contains some historical references. The scribe made some clear mistakes in copying his text. The second part with the tables shows where the planets could be found from 1391 onwards. One possible source for the compiler of this almanac could be the almanac of Johannes de Saxonia. However, more study is needed before any conclusions can be reached.
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