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  2. Four corners of the world - Wikipedia

    en.wikipedia.org/wiki/Four_corners_of_the_world

    In Mesopotamian cosmology, four rivers flowing out of the garden of creation, which is the center of the world, define the four corners of the world. [1] From the point of view of the Akkadians, the northern geographical horizon was marked by Subartu, the west by Mar.tu, the east by Elam and the south by Sumer; later rulers of all of Mesopotamia, such as Cyrus, claimed among their titles LUGAL ...

  3. 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.

  4. Flammarion engraving - Wikipedia

    en.wikipedia.org/wiki/Flammarion_engraving

    After recounting the legend [12] he remarks that "the preceding monks hoped to go to heaven without leaving the earth, to find 'the place where the sky and the earth touch,' and open the mysterious gateway which separates this world from the other. Such is the cosmographical notion of the universe; it is always the terrestrial valley crowned by ...

  5. Sphere of fire - Wikipedia

    en.wikipedia.org/wiki/Sphere_of_fire

    The Middle Ages broadly inherited the concept of the four elements of earth, water, air and fire arranged in concentric spheres about the earth as centre: [3] as the purest of the four elements, fire - and the sphere of fire - stood highest in the ascending sequence of the scala naturae, and closest to the superlunary world of the aether. [4]

  6. Natural environment - Wikipedia

    en.wikipedia.org/wiki/Natural_environment

    Earth's layered structure: (1) inner core; (2) outer core; (3) lower mantle; (4) upper mantle; (5) lithosphere; (6) crust. Earth science generally recognizes four spheres, the lithosphere, the hydrosphere, the atmosphere and the biosphere [3] as correspondent to rocks, water, air and life respectively.

  7. Tetractys - Wikipedia

    en.wikipedia.org/wiki/Tetractys

    Tetrad – Kosmos [4] The four rows add up to ten, which was unity of a higher order (The Dekad). The Tetractys symbolizes the four classical elements—air, fire, water, and earth. The Tetractys represented the organization of space: the first row represented zero dimensions (a point) the second row represented one dimension (a line of two points)

  8. Internal structure of Earth - Wikipedia

    en.wikipedia.org/wiki/Internal_structure_of_Earth

    Earth's crust and mantle, Mohorovičić discontinuity between bottom of crust and solid uppermost mantle. Earth's mantle extends to a depth of 2,890 km (1,800 mi), making it the planet's thickest layer. [20] [This is 45% of the 6,371 km (3,959 mi) radius, and 83.7% of the volume - 0.6% of the volume is the crust].

  9. De sphaera mundi - Wikipedia

    en.wikipedia.org/wiki/De_sphaera_mundi

    A volvelle from a sixteenth-century edition of Sacrobosco's De Sphaera. De sphaera mundi (Latin title meaning On the Sphere of the World, sometimes rendered The Sphere of the Cosmos; the Latin title is also given as Tractatus de sphaera, Textus de sphaera, or simply De sphaera) is a medieval introduction to the basic elements of astronomy written by Johannes de Sacrobosco (John of Holywood) c ...

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