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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 ...
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.
This sphere was a fused quartz gyroscope for the Gravity Probe B experiment, and differs in shape from a perfect sphere by no more than 40 atoms (less than 10 nm) of thickness. It was announced on 1 July 2008 that Australian scientists had created even more nearly perfect spheres, accurate to 0.3 nm, as part of an international hunt to find a ...
Apparent images of a spherical shape at Manchester Airport started appearing on social media back in June, ... Other users described what they said was an “orb”, a “metallic sphere”, or ...
This is a dynamic list and may never be able to satisfy particular standards for completeness. You can help by adding missing items with reliable sources. Most commonly reported shapes in UFO sightings gathered by the National UFO Reporting Center Online Database (NUFORC) This is a list of notable reported sightings of unidentified flying objects (UFOs) and related claims of close encounters ...
Jost Bürgi and Antonius Eisenhoit: Armillary sphere with astronomical clock, made in 1585 in Kassel, now at Nordiska Museet in Stockholm. An armillary sphere (variations are known as spherical astrolabe, armilla, or armil) is a model of objects in the sky (on the celestial sphere), consisting of a spherical framework of rings, centered on Earth or the Sun, that represent lines of celestial ...
The orb appears white in the distance and takes on a blue tint as it gets closer to the camera. The potential object outpaces every boat on the Hudson and quickly arcs its way past the news chopper.
The globus cruciger (Latin for 'cross-bearing orb'), also known as stavroforos sphaira (Greek: σταυροφόρος σφαίρα) [1] or "the orb and cross", is an orb surmounted by a cross. It has been a Christian symbol of authority since the Middle Ages , used on coins , in iconography , and with a sceptre as royal regalia .