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  2. Dynamics of the celestial spheres - Wikipedia

    en.wikipedia.org/wiki/Dynamics_of_the_celestial...

    Ancient, medieval and Renaissance astronomers and philosophers developed many different theories about the dynamics of the celestial spheres. They explained the motions of the various nested spheres in terms of the materials of which they were made, external movers such as celestial intelligences, and internal movers such as motive souls or ...

  3. Seven heavens - Wikipedia

    en.wikipedia.org/wiki/Seven_Heavens

    The concept of seven heavens as developed in ancient Mesopotamia where it took on a symbolic or magical meaning as opposed to a literal one. [4] The concept of a seven-tiered was likely In the Sumerian language, the words for heavens (or sky) and Earth are An and Ki. [5]

  4. Paradiso (Dante) - Wikipedia

    en.wikipedia.org/wiki/Paradiso_(Dante)

    The nine spheres are concentric, as in the standard medieval geocentric model of cosmology, [1] which was derived from Ptolemy. The Empyrean is non-material. As with his Purgatory, the structure of Dante's Heaven is therefore of the form 9+1=10, with one of the ten regions different in nature from the other nine.

  5. Celestial spheres - Wikipedia

    en.wikipedia.org/wiki/Celestial_spheres

    Taking the distance of the Sun as 1,266 Earth radii, he was forced to place the sphere of Venus above the sphere of the Sun; as a further refinement, he added the planet's diameters to the thickness of their spheres. As a consequence, his version of the nesting spheres model had the sphere of the stars at a distance of 140,177 Earth radii. [34]

  6. Ogdoad (Gnosticism) - Wikipedia

    en.wikipedia.org/wiki/Ogdoad_(Gnosticism)

    The number eight plays an important part in Gnostic systems, and it is necessary to distinguish the different forms in which it appeared at different stages in the development of Gnosticism. The earliest Gnostic systems included a theory of seven heavens and a supercelestial region called the Ogdoad.

  7. Celestial sphere - Wikipedia

    en.wikipedia.org/wiki/Celestial_sphere

    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.

  8. Hierarchy of angels - Wikipedia

    en.wikipedia.org/wiki/Hierarchy_of_angels

    There is no standard hierarchical organization in Islam that parallels the Christian division into different "choirs" or spheres, and the topic is not directly addressed in the Quran. However, it is clear that there is a set order or hierarchy that exists between angels, defined by the assigned jobs and various tasks to which angels are ...

  9. Sublunary sphere - Wikipedia

    en.wikipedia.org/wiki/Sublunary_sphere

    The seven heavens and the sublunar spheres, from an engraving of Albertus Magnus' Philosophia naturalis.. Plato and Aristotle helped to formulate the original theory of a sublunary sphere in antiquity, [4] [missing long citation] the idea usually going hand in hand with geocentrism and the concept of a spherical Earth.