- Douglas County, Washington (data.census.gov)
Douglas County, Washington has 1,819.2 square miles of land area and is the 17th largest county in Washington by total area. Douglas County, Washington is bordered by Kittitas County, Washington, Chelan County, Washington, Okanogan County, Washington, and Grant County, Washington.
- Celestial sphere (Wikipedia)
In astronomy and navigation, the celestial sphere is an abstract sphere that has an arbitrarily large radius and is concentric to Earth. All objects in the sky can be conceived as being projected upon the inner surface of the celestial sphere, which may be centered on Earth or the observer. If centered on the observer, half of the sphere would resemble a hemispherical screen over the observing location.