John of Saxony or Johannes de Saxonia or John Danko or Dancowe of Saxony was an astronomer who spent most of his active career, from about 1327-1355, at the University of Paris

University of Paris

The University of Paris was a university located in Paris, France and one of the earliest to be established in Europe. It was founded in the mid 12th century, and officially recognized as a university probably between 1160 and 1250...

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In 1327 he added an influential set of explanations and instructions (Canons) to the revision of the Alfonsine Tables

Alfonsine tables

The Alfonsine tables provided data for computing the position of the Sun, Moon and planets relative to the fixed stars....

 by his master, John of Linières. In his Canons, John divided the day into sixty parts rather than 24 hours, consistently representing time by sexagesimal fractions and multiples of a day. It is in this form that the Alfonsine tables circulated in Western Europe for the next three centuries.

Among his other contributions were a commentary on Alcabitius's Introduction to the art of astrology, which went through eleven printed editions, and an Almanac

Almanac

An almanac is an annual publication that includes information such as weather forecasts, farmers' planting dates, and tide tables, containing tabular information in a particular field or fields often arranged according to the calendar etc...

h for the years 1336 to 1380 that he computed for the meridian of Paris using the Alfonsine tables.