Astronomy (6) History (4) astronomie (3) Context (3) Teaching (3) Science (3) Portuguese (3) Observatories (3) Communities (3) Research (3) Science (3) Ciencias (3) Astronomía (3) Bâtiment universitaire (3) Astronomie (3) Astronomie (3) Sciences (3) astronomie (3) recherche (2) histoire (2) Rich people (2) Twentieth century (2) Scholars (2) Research (2) Hydrography (2) History (2) Historiography (2) Historians of science (2) Goal (Psychology) (2) Ephemerides (2)