This volume brings together a study and a critical edition and English translation of correspondence between Johannes Hevelius and his teacher at Gymnasium Academicum in Gdansk, Peter Cruger (1580-1639). This relatively small collection of letters, all of them written during Hevelius's academic trip to Leiden, Paris and London between 1630 and 1632, sheds light on the formation of young astronomer's scholarly workshop and documents the process of...