The Master and the Disciple: The Almanac of John of Ligneres and the Ephemerides of John of Saxony

摘要

In this paper, we analyse and compare two sets of tables in the framework of Alfonsine astronomy composed by John of Ligneres and his disciple, John of Saxony, respectively, both belonging to the first generation of scholars using the Alfonsine tables in Paris in the early fourteenth century. John of Ligneres's almanac is limited to the five planets, whereas the similar work by John of Saxony deals with the two luminaries as well. Moreover, there are other differences between these sets of tables concerning their principle of organization, precision, and accuracy.