The National Mall in Southwest Washington in Washington, District of Columbia — The American Northeast (Mid-Atlantic)
Cook Telescope
Become an astronomer with your visit to the Phoebe Waterman Haas Public Observatory and its Cook Memorial Telescope. Harvard University purchased the telescope from Boller & Chivens in 1966 for its Oak Ridge Observatory. The telescope was used to train students and to teach the public. In 1969 it was dedicated to Chester Sheldon Cook, a friend of the Oak Ridge Observatory.
During the International Year of Astronomy in 2009, Harvard loaned the telescope to the Smithsonian National Air and Space Museum. The Museum's goal was to "bring a telescope to the people." The telescope was so popular that Harvard gave it to the Smithsonian.
During daylight hours, the telescope may be pointed at Venus. Smaller telescopes attached to it allow safe views of the Sun. During evening hours, it is often used to observe planets, double stars, and nebulae.
Captions:
Inside the Observatory
Visitors can safely observe the Sun at the Public Observatory using a "Sun Gun" attached to the 4-inch finderscope.
Viewing the Sun:
The Cook Memorial Telescope's finderscope is often used with a "Sun Gun" to project a white light image of the Sun. This unfiltered but safe view of the Sun's surface, including any visible sunspots and darkening at the edge.
The telescope is named for Chester Sheldon Cook, an optician, pianist, long-time member of the Amateur Telescope Makers of Boston and friend of the Oak Ridge Observatory.
Pencil sketch by M. Gagan, 2/5/50; courtesy of Anna Sudarich Hillier; historian of the Amateur Telescope Makers of Boston.
←The historic 16-inch reflecting telescope inside the Public Observatory.
How to Learn More:
http://airandspace.si.edu/observatory
Erected by National Air and Space Museum.
Topics. This historical marker is listed in these topic lists: Air & Space • Education. A significant historical year for this entry is 1966.
Location. 38° 53.274′ N, 77° 1.114′ W. Marker is in Southwest Washington in Washington, District of Columbia. It is in The National Mall. It can be reached from Independence Avenue Southwest west of 4th Street Southwest, on the right when traveling west. On the grounds of the National Air and Space Museum on the side of the Phoebe Waterman Haas Public Observatory. Touch for map. Marker is in this post office area: Washington DC 20024, United States of America. Touch for directions.
Regionally, this marker is in the Washington Metropolitan Area. It is also in the American Northeast, in the Upper South, in the Mid-Atlantic, in the Tidewater, and in the Chesapeake Bay Region. Globally, it is in the North Atlantic Region, North America, the Western Hemisphere, the Western World, and the Anglosphere.
Other nearby markers. At least 8 other markers are within walking distance of this marker: Sun (here, next to this marker); Phoebe Waterman Haas (here, next to this marker); Venus (here, next to this marker); Saturn (here, next to this marker); Moon
Credits. This page was last revised on January 30, 2023. It was originally submitted on December 12, 2017, by Devry Becker Jones of Washington, District of Columbia. This page has been viewed 544 times since then and 18 times this year. Photos: 1, 2. submitted on December 12, 2017, by Devry Becker Jones of Washington, District of Columbia. • Bill Pfingsten was the editor who published this page.

