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  2. Earth's rotation - Wikipedia

    en.wikipedia.org/wiki/Earth's_rotation

    Earth's rotation axis moves with respect to the fixed stars (inertial space); the components of this motion are precession and nutation. It also moves with respect to Earth's crust; this is called polar motion. Precession is a rotation of Earth's rotation axis, caused primarily by external torques from the gravity of the Sun, Moon and other bodies.

  3. Coriolis frequency - Wikipedia

    en.wikipedia.org/wiki/Coriolis_frequency

    Consider a body (for example a fixed volume of atmosphere) moving along at a given latitude at velocity in the Earth's rotating reference frame. In the local reference frame of the body, the vertical direction is parallel to the radial vector pointing from the center of the Earth to the location of the body and the horizontal direction is perpendicular to this vertical direction and in the ...

  4. Foucault pendulum - Wikipedia

    en.wikipedia.org/wiki/Foucault_pendulum

    The Foucault pendulum or Foucault's pendulum is a simple device named after French physicist Léon Foucault, conceived as an experiment to demonstrate the Earth's rotation. If a long and heavy pendulum suspended from the high roof above a circular area is monitored over an extended period of time, its plane of oscillation appears to change ...

  5. Earth Has Tilted 31.5 Inches. That Shouldn't Happen. - AOL

    www.aol.com/earth-tilted-31-5-inches-220100485.html

    The study included data from 1993 through 2010, and showed that the pumping of as much as 2,150 gigatons of groundwater has caused a change in the Earth’s tilt of roughly 31.5 inches. The ...

  6. Polar motion - Wikipedia

    en.wikipedia.org/wiki/Polar_motion

    Polar motion of the Earth is the motion of the Earth's rotational axis relative to its crust. [2]: 1 This is measured with respect to a reference frame in which the solid Earth is fixed (a so-called Earth-centered, Earth-fixed or ECEF reference frame). This variation is a few meters on the surface of the Earth.

  7. Melting ice is slowing Earth's rotation, shifting its axis ...

    www.aol.com/news/melting-ice-slowing-earths-spin...

    Somewhat similarly, the friction of ocean tides from the moon’s gravitational pull slows the Earth’s rotation. Historically, that has had the largest influence on the planet’s rate of spin ...

  8. Earth orientation parameters - Wikipedia

    en.wikipedia.org/wiki/Earth_Orientation_Parameters

    Due to the very slow pole motion of the Earth, the Celestial Ephemeris Pole (CEP, or celestial pole) does not stay still on the surface of the Earth.The Celestial Ephemeris Pole is calculated from observation data, and is averaged, so it differs from the instantaneous rotation axis by quasi-diurnal terms, which are as small as under 0.01" (see [6]).

  9. In 'Deep Impact,' 'Armageddon,' asteroids threaten Earth ...

    www.aol.com/entertainment/deep-impact-armageddon...

    In the summer of 1998, Hollywood offered up not one, but two blockbuster films about asteroids hurtling towards Earth. Released on May 8 of that year, Deep Impact, directed by Mimi Leder, told a ...