The Great Lick Refractor is a historic telescope located at the Lick Observatory in California. Completed in 1888, it features a 36-inch diameter lens, making it one of the largest refracting telescopes ever built. The telescope was designed by George Ellery Hale and played a significant role in advancing astronomical research during its time. This telescope has contributed to numerous discoveries, including observations of the planet Mars and the study of stellar spectra. The Great Lick Refractor remains an important symbol of 19th-century astronomy and continues to be used for educational purposes and public outreach at the observatory.