# Cassini's Division: Saturn's Hidden Gap Revealed in 1675
Published: December 29, 2025
Duration: 1:32
# This is your Astronomy Tonight podcast.
Good evening, stargazers! On this date, December 29th, we have a truly remarkable astronomical event to celebrate.
**The Discovery of Cassini's Division - December 29, 1675**
On this very day in 1675, the Italian-French astronomer Giovanni Cassini made one of the most stunning discoveries in planetary science: he observed a prominent gap in Saturn's rings! This wasn't just any gap—it was a substantial, clearly defined division that would come to bear his name: **Cassini's Division**.
Picture this: Cassini is peering through his telescope at Saturn, and suddenly, he no...
Good evening, stargazers! On this date, December 29th, we have a truly remarkable astronomical event to celebrate.
**The Discovery of Cassini's Division - December 29, 1675**
On this very day in 1675, the Italian-French astronomer Giovanni Cassini made one of the most stunning discoveries in planetary science: he observed a prominent gap in Saturn's rings! This wasn't just any gap—it was a substantial, clearly defined division that would come to bear his name: **Cassini's Division**.
Picture this: Cassini is peering through his telescope at Saturn, and suddenly, he no...