Felix Meritis, the remarkable 'Temple of Enlightenment', adorns the Amsterdam canals since 1788. The building accommodated the most ambitious attempt in the Netherlands for the integration of activities regarding literature, music, the visual arts, commerce, and the sciences. What so far went unnoticed is that, from the very start, Felix Meritis was also equipped with an astronomical and meteorological observatory. In fact, it was the first scientific observatory in the Netherlands designed f...