There is no recognized patron saint specifically for astronomy. Some possible reasons for this include:

* Astronomy's complex history: Astronomy has roots in various cultures and traditions, and its development wasn't solely tied to one specific religious figure.

* Scientific focus: As a field of study, astronomy primarily focuses on the scientific observation and understanding of celestial objects and phenomena. It doesn't have a strong religious connotation.

* Patron saints' varied roles: Patron saints are typically chosen for their association with a specific profession, cause, or location. While some saints are connected to areas with scientific interest (like Saint Albertus Magnus and natural philosophy), astronomy hasn't been assigned a specific patron.

It's possible that you might be thinking of a different saint or confusing astronomy with another field. Could you provide more context about where you encountered this information?