The Holt & Miller Observatory
The Holt & Miller Observatory houses the 10” Carl Zeiss Refracting Telescope, one of the largest historical artifacts in the museum's collection (FI Cat. #1437). It is only one of two surviving Zeiss Telescopes of this model. The other is located at the Griffith Observatory in Los Angeles. During select daytime hours, this fully functioning telescope provides the opportunity to safely view the Sun in real-time, including sunspots and prominences, while the rooftop location offers a unique view of the Philadelphia Skyline.
The Holt & Miller Observatory is operated and maintained by The Franklin Institute’s Chief Astronomer, Derrick Pitts.
The Holt & Miller Observatory is closed for repairs. We apologize for the inconvenience.