JHA https://doi.org/10.1177/0021828618820215 Journal for the History of Astronomy 2019, Vol. 50(1) 82–96 © The Author(s) 2018 Article reuse guidelines: sagepub.com/journals-permissions DOI: 10.1177/0021828618820215 journals.sagepub.com/home/jha The Master and the Disciple: The Almanac of John of Lignères and the Ephemerides of John of Saxony José Chabás Universitat Pompeu Fabra, Spain Bernard R. Goldstein University of Pittsburgh, USA Abstract In this paper, we analyse and compare two sets of tables in the framework of Alfonsine astronomy composed by John of Lignères 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 Lignères’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. Keywords Azarquiel, Jacob ben Makhir, Parisian Alfonsine Tables, planetary periods of return, Regiomontanus In a previous study, we addressed an almanac compiled by John of Lignères (fl. 1320– 1335), uniquely preserved (as far as we knew) in an incomplete copy, in Philadelphia, Free Library, MS Lewis E.3, 3r–10r. 1 In this manuscript, the set of tables begins abruptly in the middle of a table for Saturn, and thus no complete copy of the almanac was known at the time. In a recent visit to the Vatican Library, one of us examined two more copies of it, hitherto not known to contain this work. Both manuscripts preserve a complete set Corresponding author: José Chabás, Universitat Pompeu Fabra, Carrer Roc Boronat 138, 08018, Barcelona, Spain. Email: josechabas@gmail.com 820215JHA 0 0 10.1177/0021828618820215Journal for the History of AstronomyChabás and Goldstein research-article 2018 Article