Edward Singleton Holden was an American astronomer and the fifth president of the University of California.

The Washburn Observatory is an astronomical observatory located at 1401 Observatory Drive on the University of Wisconsin–Madison campus in Madison, Wisconsin, United States. Completed in 1881, it was a major research facility for about 50 years. Today, it is home to the UW-Madison College of Letters and Science Honors Program, while the telescope remains in use by students in introductory astronomy courses and the general public during open houses and viewings.