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Visualization of a celestial sphere. 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.
The celestial sphere is conventionally divided into designated areas called constellations. Usually, the term sky informally refers to a perspective from the Earth's surface; however, the meaning and usage can vary.
The celestial spheres, or celestial orbs, were the fundamental entities of the cosmological models developed by Plato, Eudoxus, Aristotle, Ptolemy, Copernicus, and others. In these celestial models, the apparent motions of the fixed stars and planets are accounted for by treating them as embedded in rotating spheres made of an aetherial ...
The name Sepehr originates from Persian poetry and astronomy, where it is associated with the celestial sphere, a concept used in ancient Persian cosmology to describe the heavens. In Persian literature, Sepehr frequently symbolizes the infinite beauty and harmony of the sky, often appearing in the works of poets such as Ferdowsi and Hafez.
The celestial poles form the north and south poles of the equatorial coordinate system. celestial sphere An imaginary sphere that encompasses the Earth's entire sky and is stationary with respect to the background stars. It is the basis for spherical astronomy. centaur
The five red dots represent the zenith, the nadir (the point on the celestial sphere opposite the zenith with respect to the observer), their projections on the celestial equatorial plane, and the center (with no physical meaning attached) of the circle obtained by projecting the secondary meridian (see below) on the celestial equatorial plane.
The Quran and Hadith frequently mention the existence of seven samāwāt (سماوات), the plural of samāʾ (سماء), meaning 'heaven, sky, celestial sphere', and cognate with Hebrew shamāyim (שמים). Some of the verses in the Quran mentioning the samaawat [21] are Q41:12, Q65:12 and Q71:15.
There are twenty-seven homocentric spheres with each sphere explaining a type of observable motion for each celestial object. Eudoxus emphasised that this is a purely mathematical construct of the model in the sense that the spheres of each celestial body do not exist, it just shows the possible positions of the bodies. [41] Aristotelian universe