William Miller Sperry Observatory will be closed on December 26 and January 2 in observance of the holidays. We will reopen on Friday, January 9, 2026. Amateur Astronomers, Inc. wishes everyone Happy Holidays and a safe and Happy New Year.

And learn about Amateur Astronomers, Inc. the Astronomy club that makes its home at Sperry Observatory located on the campus of Union College in Cranford, NJ and how you can join. And, weather permitting, we will do observing through our 2 large telescopes, a 24 inch reflector and a 10 inch refractor.

Amateur Astronomers, Inc. (also known as AAI), is 76 years young and still going strong!

See below for information regarding Observatory hours.

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All visitors must register to enter the Sperry Observatory. Admission and programs are free of charge.

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