celestial sphere

• Sphère imaginaire de rayon arbitrairement grand, concentrique à l'observateur, sur laquelle semblent se projeter tous les objets célestes tels que les étoiles, les planètes et le Soleil. C'est un concept fondamental en astronomie pour cartographier et localiser les objets dans le ciel.

An imaginary sphere of arbitrarily large radius, concentric with the observer, upon which all celestial objects such as stars, planets, and the Sun appear to be projected. It is a fundamental concept in astronomy for mapping and locating objects in the sky.

1. Imaginary sphere in astronomyC1formal

   An imaginary sphere of arbitrarily large radius, concentric with the observer, on which all celestial objects are considered to lie.

   sphère céleste

   • Astronomers use the celestial sphere to map the positions of stars and planets.
   • The celestial sphere is divided into constellations.
   • The concept of the celestial sphere helps simplify the observation of the night sky.