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  2. Earth's orbit - Wikipedia

    en.wikipedia.org/wiki/Earth's_orbit

    The point towards which the Earth in its solar orbit is directed at any given instant is known as the "apex of the Earth's way". [4] [5] From a vantage point above the north pole of either the Sun or Earth, Earth would appear to revolve in a counterclockwise direction around the Sun. From the same vantage point, both the Earth and the Sun would ...

  3. Aristarchus of Samos - Wikipedia

    en.wikipedia.org/wiki/Aristarchus_of_Samos

    Aristarchus of Samos (/ ˌ æ r ə ˈ s t ɑːr k ə s /; Ancient Greek: Ἀρίσταρχος ὁ Σάμιος, Aristarkhos ho Samios; c. 310 – c. 230 BC) was an ancient Greek astronomer and mathematician who presented the first known heliocentric model that placed the Sun at the center of the universe, with the Earth revolving around the Sun once a year and rotating about its axis once a day.

  4. File:Motion of Sun, Earth and Moon around the Milky Way.jpg

    en.wikipedia.org/wiki/File:Motion_of_Sun,_Earth...

    The Solar System traces out a sinusoidal path in its orbit around the galactic center. Using Galactic North as the initial frame of reference, the Earth and Sun rotate counterclockwise, and the Earth revolves in a counterclockwise direction around the Sun. However, the Sun and its satellites revolve CLOCKWISE around the Milky Way.

  5. Earth's rotation - Wikipedia

    en.wikipedia.org/wiki/Earth's_rotation

    Earth's movement along its nearly circular orbit while it is rotating once around its axis requires that Earth rotate slightly more than once relative to the fixed stars before the mean Sun can pass overhead again, even though it rotates only once (360°) relative to the mean Sun. [n 5] Multiplying the value in rad/s by Earth's equatorial ...

  6. Heliocentrism - Wikipedia

    en.wikipedia.org/wiki/Heliocentrism

    It used to be thought that he believed Mercury and Venus to revolve around the Sun, which in turn (along with the other planets) revolves around the Earth. [10] Macrobius (AD 395—423) later described this as the "Egyptian System," stating that "it did not escape the skill of the Egyptians ," though there is no other evidence it was known in ...

  7. Ecliptic - Wikipedia

    en.wikipedia.org/wiki/Ecliptic

    For example, the Sun is north of the celestial equator for about 185 days of each year, and south of it for about 180 days. [7] The variation of orbital speed accounts for part of the equation of time. [8] Because of the movement of Earth around the Earth–Moon center of mass, the apparent path of the Sun wobbles slightly, with a period of ...

  8. Copernican heliocentrism - Wikipedia

    en.wikipedia.org/wiki/Copernican_heliocentrism

    The Earth is one of several planets revolving around a stationary sun in a determined order. The Earth has three motions: daily rotation, annual revolution, and annual tilting of its axis. Retrograde motion of the planets is explained by the Earth's motion.

  9. Orrery - Wikipedia

    en.wikipedia.org/wiki/Orrery

    A tellurion will show the Earth with the Moon revolving around the Sun. It will use the angle of inclination of the equator from the table above to show how it rotates around its own axis. It will show the Earth's Moon, rotating around the Earth. [23] A lunarium is designed to show the complex motions of the Moon as it revolves around the Earth.

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