Mt. SAC – Randall Planetarium

The Randall Planetarium at Mt. SAC has been serving the community for over 40 years since opening its doors in 1968. The facility is used as an instructional facility (astronomy classes, presentations for local schools) and for public productions that open our remarkable galaxy to the community at large. The Randall Planetarium facility has a 35-foot-diameter hemispherical dome and seats up to 75 persons.

New planetarium shows are offered every month, tickets for these shows can purchased online or at the door. Free telescope viewing is also available once a month at the Mt. SAC Observatory (weather permitting). See their calendar for schedule.

Also offers a variety of packages for birthdays, field trips, scouts, and other events.



Mt. SAC Randall Planetarium
1100 N. Grand Ave.
Walnut, CA 91789
(909) 274-5795


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