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The tree of life ( Hebrew: עֵץ חַיִּים, romanized : ʿēṣ ḥayyim or no: אִילָן, romanized : ʾilān, lit. 'tree') is a diagram used in Rabbinical Judaism in kabbalah and other mystical traditions derived from it. [ 1] It is usually referred to as the "kabbalistic tree of life" to distinguish it from the tree of life that ...
Celestial spheres. 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 ...
The tetractys. The tetractys ( Greek: τετρακτύς ), or tetrad, [ 1] or the tetractys of the decad[ 2] is a triangular figure consisting of ten points arranged in four rows: one, two, three, and four points in each row, which is the geometrical representation of the fourth triangular number. As a mystical symbol, it was very important to ...
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 musica universalis (literally universal music ), also called music of the spheres or harmony of the spheres, is a philosophical concept that regards proportions in the movements of celestial bodies —the Sun, Moon, and planets —as a form of music. The theory, originating in ancient Greece, was a tenet of Pythagoreanism, and was later ...
Isotropic coordinates. In the theory of Lorentzian manifolds, spherically symmetric spacetimes admit a family of nested round spheres. There are several different types of coordinate chart which are adapted to this family of nested spheres; the best known is the Schwarzschild chart, but the isotropic chart is also often useful.
Concentric spheres. The cosmological model of concentric (or homocentric) spheres, developed by Eudoxus, Callippus, and Aristotle, employed celestial spheres all centered on the Earth. [ 1][ 2] In this respect, it differed from the epicyclic and eccentric models with multiple centers, which were used by Ptolemy and other mathematical ...
Studies analyzing starlight patterns identified unusual radiation that could suggest the existence of Dyson Spheres, potentially pointing to alien civilizations.