Astronomical observatories

Ling's handwritten table of Parallax Factors.

Howe's transit observations

Howe's transit observations

Howe's transit observations

Black and white print of four young women looking at the 20-inch refracting telescope inside Chamberlin Observatory on the University Park Campus of the University of Denver in Denver, Colorado in 1954.

Black and white print of three unidentified men assembling or repairing a telescope lens inside Chamberlin Observatory on the University Park Campus of the University of Denver in Denver, Colorado.

Black and white print of a boy looking through a telescope at the Chamberlin Observatory on the University Park Campus of the University of Denver in Denver, Colorado, while a woman walks up the steps to the platform. The sign on the platform reads, "Caution Platform holds 2 persons only".

A group of unidentified people wait in line to look through the telescope inside Chamberlin Observatory on the University Park Campus of the University of Denver in Denver, Colorado. Two men are going up the steps to the platform, and two more are coming down the steps on the other side.

A group of unidentified people wait in line to look through the telescope inside Chamberlin Observatory on the University Park Campus of the University of Denver in Denver, Colorado. A woman is climbing the steps up to the platform, while another woman is descending the steps on the other side.

A group of of unidentified persons, including several young children, wait in line to look through the telescope inside Chamberlin Observatory on the University Park Campus of the University of Denver in Denver, Colorado.