For 25 years, from 2013 to 2038, the Bavarian Academy of the Sciences in Munich will be hosting a project which is concerned with editing and studying the astronomical and astrological heritage of Ptolemy in the Islamic world and Christian Europe up to the 17th century. The central aim of the project is to provide a new textual foundation for our understanding of the Ptolemaic tradition. To this end, the project will retrieve the Arabic and Latin versions of the Almagest and Tetrabiblos, of Ptolemy’s minor works, of Pseudo-Ptolemaica and of the commentary literature in its manifold forms. The result of this work will be made accessible in the form of online presentations of manuscripts, searchable texts and technical tools. Critical editions, catalogues and studies will appear in the publication series Ptolemaeus Arabus et Latinus. Chief members of the project team are – apart from me – David Juste and Benno van Dalen. However, retrieving the Ptolemaic tradition will involve many more scholars. The project’s publication channels, in print as well as on the website, are open to refereed work from all colleagues working on the Ptolemaic tradition.