celestial sphere

• كرة وهمية ذات نصف قطر كبير جدًا ومركزها عند الراصد، تُسقط عليها مواقع الأجرام السماوية كالنجوم والكواكب والشمس لتبدو وكأنها تتحرك عليها. مفهوم أساسي في علم الفلك لتحديد مواقع الأجرام ورسم خرائط السماء.

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.

   الكرة السماوية

   • 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.