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  2. History of gravitational theory - Wikipedia

    en.wikipedia.org/.../History_of_gravitational_theory

    Greek philosopher Plutarch (c. 46 – c. 120 AD) attested the existence of Roman astronomers who rejected Aristotelian physics, "even contemplating theories of inertia and universal gravitation", [32] [33] and suggested that gravitational attraction was not unique to the Earth. [34] The gravitational effects of the Moon on the tides were ...

  3. Geocentric model - Wikipedia

    en.wikipedia.org/wiki/Geocentric_model

    Ancient Greek, ancient Roman, and medieval philosophers usually combined the geocentric model with a spherical Earth, in contrast to the older flat-Earth model implied in some mythology. However, the Greek astronomer and mathematician Aristarchus of Samos ( c. 310 – c. 230 BC ) developed a heliocentric model placing all of the then-known ...

  4. On Floating Bodies - Wikipedia

    en.wikipedia.org/wiki/On_Floating_Bodies

    Archimedes spells out the law of equilibrium of fluids, and proves that water will adopt a spherical form around a centre of gravity. [4] This may have been a reference to contemporary Greek theory that the Earth is round, which is also found in the works of others such as Eratosthenes. The fluids described by Archimedes are not self ...

  5. Spherical Earth - Wikipedia

    en.wikipedia.org/wiki/Spherical_Earth

    The spherical shape of the Earth was known and measured by astronomers, mathematicians, and navigators from a variety of literate ancient cultures, including the Hellenic World, and Ancient India. Greek ethnographer Megasthenes, c. 300 BC, has been interpreted as stating that the contemporary Brahmans of India believed in a spherical Earth as ...

  6. History of the center of the Universe - Wikipedia

    en.wikipedia.org/wiki/History_of_the_center_of...

    For Newton, it was not precisely the centre of the Sun or any other body that could be considered at rest, but rather "the common centre of gravity of the Earth, the Sun and all the Planets is to be esteem'd the Centre of the World", and this centre of gravity "either is at rest or moves uniformly forward in a right line" (Newton adopted the ...

  7. Earth ring theory may shed light on an unexplained ancient ...

    www.aol.com/earth-may-had-saturn-ring-115417013.html

    A large asteroid broken apart by Earth's gravitational pull could have formed a Saturn-like ring around the planet about 466 million years ago, a new study found.

  8. Deferent and epicycle - Wikipedia

    en.wikipedia.org/wiki/Deferent_and_epicycle

    Some Greek astronomers (e.g., Aristarchus of Samos) speculated that the planets (Earth included) orbited the Sun, but the optics (and the specific mathematics – Isaac Newton's law of gravitation for example) necessary to provide data that would convincingly support the heliocentric model did not exist in Ptolemy's time and would not come ...

  9. Gravity - Wikipedia

    en.wikipedia.org/wiki/Gravity

    In physics, gravity (from Latin gravitas 'weight' [1]) is a fundamental interaction primarily observed as mutual attraction between all things that have mass.Gravity is, by far, the weakest of the four fundamental interactions, approximately 10 38 times weaker than the strong interaction, 10 36 times weaker than the electromagnetic force and 10 29 times weaker than the weak interaction.