Internal seminar 2022

Org. Eleonora Andriani, Nick Jacobson, Sophie Serra, Samuel Gessner, Matthieu Husson

Observatoire de Paris, 77 avenue Denfert-Rochereau, 75014 Paris.

This seminar is open to the public, however due to the current sanitary restrictions it will be accesible only through virtual participation. If you want to participate in this way please register at least 48h in advance by writting a message to We will send you the contact information.

We hope to be able to welcome colleagues in Paris Observatory as soon as possible!


This years seminar is devoted to explore new question in relation to ALFA third phase of research. In this respect we explore topics in related astronomical traditions as well as in scientific discpline connected to mathematical astronomy in the Latin medieval context. We also continue to discuss works in progress of the team members on Alfonsine sources.


Nov. 25, 2021 14h30-17h30

Camille Bui, Latitudes tables and canons in the Alfonsine tradition


Jan. 16, 2021 14h30-17h30

Maria Sorokina, Spheres, stars and theologians: a renewal of medieval cosmology in the Sentences commmentaries


Jan. 21, 2022 14h30-17h30

Scott Trigg, Thinking with diagrams in Islamicate astronomy: phenomenon, problems and solutions


Feb. 17, 2022 14h30-17h30

Sophie Serra, John of Sicily as an entry point into late 13th century Parisian conception of Astronomy


March. 17, 2022 14h30-17h30

Sophie Serra, John of Sicily conception of astronomy: sources and references


March. 31, 2022 14h30-17h30

Andriani Eleonora and Stefan Zieme, On regiomontanus derivation of the solar Equation


April. 7, 2022 14h30-17h30

Marie-Madeleine Saby and Samuel Gessner, John Vimond Planicelium


April. 15, 2022 14h30-17h30

Nick Jacobson, A Directoriumattributed to John of Lignères


April. 28, 2022 14h30-17h30

Andriani Eleonora and Matthieu Husson, John of Lignères Fiat primo regula


May 12, 2022 14h30-17h30

Camille Bui, Latitudes tables and canons in Alfonsine astronomy