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  2. Concentric spheres - Wikipedia

    en.wikipedia.org/wiki/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 astronomers until the time of Copernicus.

  3. Celestial spheres - Wikipedia

    en.wikipedia.org/wiki/Celestial_spheres

    In Greek antiquity the ideas of celestial spheres and rings first appeared in the cosmology of Anaximander in the early 6th century BC. [7] In his cosmology both the Sun and Moon are circular open vents in tubular rings of fire enclosed in tubes of condensed air; these rings constitute the rims of rotating chariot-like wheels pivoting on the Earth at their centre.

  4. Eudoxus of Cnidus - Wikipedia

    en.wikipedia.org/wiki/Eudoxus_of_Cnidus

    Eudoxus, son of Aeschines, was born and died in Cnidus (also transliterated Knidos), a city on the southwest coast of Anatolia. [3] The years of Eudoxus' birth and death are not fully known but Diogenes Laërtius gave several biographical details, mentioned that Apollodorus said he reached his acme in the 103rd Olympiad (368– 365 BC), and claimed he died in his 53rd year.

  5. 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.

  6. Eudoxus (lunar crater) - Wikipedia

    en.wikipedia.org/wiki/Eudoxus_(lunar_crater)

    Eudoxus is a prominent lunar impact crater that lies to the east of the northern tip of the Montes Caucasus range. It is named after the Greek astronomer Eudoxus of Cnidus . [ 1 ] It is located to the south of the prominent crater Aristoteles in the northern regions of the visible Moon .

  7. Walmart recalls magnetic balls after CPSC warns of choking ...

    www.aol.com/walmart-recalls-magnetic-balls-cpsc...

    The toy kit was sold from February 2022 through April 2023 for between $14 and $15 and is made of small magnetic balls in purple, black, green, blue, orange and red. For more CNN news and ...

  8. Callippus - Wikipedia

    en.wikipedia.org/wiki/Callippus

    Callippus was born at Cyzicus, and studied under Eudoxus of Cnidus at the Academy of Plato. He also worked with Aristotle at the Lyceum, which means that he was active in Athens prior to Aristotle's death in 322 BC. He observed the movements of the planets and attempted to use Eudoxus' scheme of connected spheres to account for their movements.

  9. Magnetic balls sold at Walmart recalled due to risk of ...

    www.aol.com/news/magnetic-balls-sold-walmart...

    Thousands of sets of high-powered magnetic balls sold at Walmart have been recalled after federal regulators issued a warning about the potential risk of choking, serious injuries and death.

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