National Historic Landmark plaque

Title

National Historic Landmark plaque

Subject

astronomy, observatory

Description

The University of Illinois Observatory is historically significant for the development of selenium and photoelectric cell photometry that revolutionized the measurement of celestial magnitudes. The determination of stellar magnitudes is one of the most fundamental measurements in astronomy. During the years from 1907 to 1922, Observatory director Joel Stebbins worked with physicists F.C. Brown, W.F. Schulz, and Jakob Kunz to develop and refine electric photometry.

In 1989, the United States Department of the Interior designated the Observatory and National Historic Landmark.

Creator

United States Department of the Interior

Publisher

Astronomy Department, University of Illinois, Urbana, Illinois

Date

1989

Contributor

Michael Svec

Rights

Copyright Michael Svec

Format

image/jpg

Language

English

Type

physical object

Coverage

University of Illinois Observatory, Urbana, Illinois

Files

HPIM1254.JPG

Tags

Citation

United States Department of the Interior, “National Historic Landmark plaque,” University of Illinois Observatory Collection, accessed December 16, 2017, http://uiobservatory.omeka.net/items/show/28.