[7] By the 1890s, railroad traffic around the original building had grown to the point where the vibrations were disrupting the astronomical instruments.

[9] After World War II, Dudley began a transition from astronomical observation to research for the space race.

[12] After briefly being located in a strip mall in Latham, New York, the observatory donated its rare book collection to the Union College Library.

A collection of scientific hardware, including a Brashear refracting telescope and equatorial mount, were donated to the New York State Museum in Albany.

[16] The Dudley Observatory maintains a collection of rare books including first editions by Galileo and Copernicus.