Annie Jump Cannon is the subject of a doodle today on Google’s homepage, as the search giant celebrates her 151st birthday.

Cannon was an astronomer whose work was considered instrumental in the development of contemporary stellar classification. She, along with Edward C. Pickering, is credited with the creation of the Harvard Classification Scheme. This is said to be the first “serious attempt” to organize and classify stars based on temperature.

Cannon’s astronomy career spanned 40 years, and during that time, helped women gain respect within the scientific community. She died in 1941, the year after she retired. The American Astronomical Society presents an award in her name to female astronomers each year.

Space has been of particular interest lately when it comes to Google doodles. The company recently ran one to celebrate the Philae probe, which soft-landed on a comet.

Image via Google