This short documentary marks the centenary of the birth of Maria Assumpció Català and celebrates her decisive role in shaping modern Spanish astronomy. It traces her path from postwar mathematics student to the first professional female astronomer at a Spanish university and the first woman to earn a PhD in mathematics from the University of Barcelona, highlighting her contributions to solar physics, cometary orbit calculations, and galactic dynamics. The film underscores her pivotal leadership in securing Spain’s participation in Hipparcos, integrating the country into European astronomical research and laying the groundwork for its prominent role today in missions such as Gaia.