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  2. Earth's orbit - Wikipedia

    en.wikipedia.org/wiki/Earth's_orbit

    Ignoring the influence of other Solar System bodies, Earth's orbit, also called Earth's revolution, is an ellipse with the Earth–Sun barycenter as one focus with a current eccentricity of 0.0167. Since this value is close to zero, the center of the orbit is relatively close to the center of the Sun (relative to the size of the orbit).

  3. Milankovitch cycles - Wikipedia

    en.wikipedia.org/wiki/Milankovitch_cycles

    The Earth's orbit varies between nearly circular and mildly elliptical (its eccentricity varies). When the orbit is more elongated, there is more variation in the distance between the Earth and the Sun, and in the amount of solar radiation, at different times in the year.

  4. File:Earths orbit and ecliptic.PNG - Wikipedia

    en.wikipedia.org/wiki/File:Earths_orbit_and...

    That’s only the apparent path if your presumption is that the earth and stars are stationary and the sun is revolving around the earth. It’s been quite a while since that was the first thought that entered one’s mind as the explanation for the sun’s movement across the sky, so that isn’t a description that quickly conveys the desired ...

  5. Orbital mechanics - Wikipedia

    en.wikipedia.org/wiki/Orbital_mechanics

    To escape the Solar System from a location at a distance from the Sun equal to the distance Sun–Earth, but not close to the Earth, requires around 42 km/s velocity, but there will be "partial credit" for the Earth's orbital velocity for spacecraft launched from Earth, if their further acceleration (due to the propulsion system) carries them ...

  6. File:Euler diagram of solar system bodies.svg - Wikipedia

    en.wikipedia.org/wiki/File:Euler_diagram_of...

    And if the dust is orbiting a body other than the Sun, as with the countless particles of Saturn's rings, then these fit with natural satellites, which also have no lower limit defined. This diagram could be further refined to show how moonlets and dust fall within the category of natural satellites, with a separate set of cosmic dust orbiting ...

  7. Ecliptic - Wikipedia

    en.wikipedia.org/wiki/Ecliptic

    As seen from the orbiting Earth, the Sun appears to move with respect to the fixed stars, and the ecliptic is the yearly path the Sun follows on the celestial sphere. This process repeats itself in a cycle lasting a little over 365 days. The ecliptic or ecliptic plane is the orbital plane of Earth around the Sun.

  8. Sun-synchronous orbit - Wikipedia

    en.wikipedia.org/wiki/Sun-synchronous_orbit

    An orbit will be Sun-synchronous when the precession rate ρ = ⁠ dΩ / dt ⁠ equals the mean motion of the Earth about the Sun n E, which is 360° per sidereal year (1.990 968 71 × 10 −7 rad/s), so we must set n E = ⁠ ΔΩ E / T E ⁠ = ρ = ⁠ ΔΩ / T ⁠, where T E is the Earth orbital period, while T is the period of the spacecraft ...

  9. Outline of the Solar System - Wikipedia

    en.wikipedia.org/wiki/Outline_of_the_Solar_System

    Solar System – gravitationally bound system comprising the Sun and the objects that orbit it, either directly or indirectly. Of those objects that orbit the Sun directly, the largest eight are the planets (including Earth), with the remainder being significantly smaller objects, such as dwarf planets and small Solar System bodies.