William Miller Sperry Observatory

The William Miller Sperry Observatory is an astronomical facility at Union County College in Cranford that houses two major telescopes for night sky viewing. A 10-inch refractor telescope sits in the East Dome, while a 24-inch Cassegrain reflector telescope occupies the West Dome.

The facility began operations in 1967 after a significant donation was made to honor William Miller Sperry. This founding moment launched what became a long-standing program of public astronomy at the site.

The facility is run by Amateur Astronomers Incorporated, who organize regular public viewing nights that bring local people together around stargazing. Visitors experience the night sky as part of a community of people interested in what happens above.

The observatory opens to visitors every Friday night throughout the year, offering separate sessions for youth groups and the general public. Plan to dress warmly and note that clear skies are needed for good viewing opportunities.

Both telescopes rest on a concrete foundation anchored by deep pilings that minimize vibrations during observations. This specialized construction allows stargazers to see the sky with exceptional clarity and detail.

Location: New Jersey

GPS coordinates: 40.66640,-74.32330

Latest update: December 14, 2025 17:02