Image: Wikimedia Commons

celestial sphere

Imaginary sphere of arbitrarily large radius, concentric with the observer

EntitysphereQ12134

Instance of: sphere
1
Sources
1.Stated in A Short History of Astronomy
View statement on Wikidata ↗
Part of: astronomy

Overview

From Wikipedia, the free encyclopedia · Read full article · Text CC BY-SA 4.0

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.

Overview

All data

51 statements · 10% with external sources · numbers in brackets are citations

Members / parts: Northern celestial hemisphere
Southern Celestial Hemisphere
celestial hemisphere
nadir
Different from: firmament
Depicts: observable universe

On other databases

23 identifiers linking celestial sphere across the web's reference databases

Data quality

statements

10%

externally sourced

Source last edited August 24, 2026. AIDB refreshes this page daily.

Suggest a fact or correction

Links

Use this data

curl https://aidb.si/api/v1/entities/Q12134

API docs, limits & keys

Cite this page

AIDB. (2026). celestial sphere (Q12134). Retrieved from https://aidb.si/e/celestial-sphere-Q12134