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  2. Earth's rotation - Wikipedia

    en.wikipedia.org/wiki/Earth's_rotation

    The average of the true solar day during the course of an entire year is the mean solar day, which contains 86,400 mean solar seconds. Currently, each of these seconds is slightly longer than an SI second because Earth's mean solar day is now slightly longer than it was during the 19th century due to tidal friction. The average length of the ...

  3. Inner core super-rotation - Wikipedia

    en.wikipedia.org/wiki/Inner_core_super-rotation

    Waves were observed to travel faster between north and south than along the equatorial plane. A model for the inner core with uniform anisotropy had a direction of fastest travel tilted at an angle 10° from the spin axis of the Earth. [15] Since then, the model for the anisotropy has become more complex. The top 100 kilometers are isotropic.

  4. Celestial pole - Wikipedia

    en.wikipedia.org/wiki/Celestial_pole

    As Earth spins on its axis, the two celestial poles remain fixed in the sky, and all other celestial points appear to rotate around them, completing one circuit per day (strictly, per sidereal day). The celestial poles are also the poles of the celestial equatorial coordinate system , meaning they have declinations of +90 degrees and −90 ...

  5. Earth’s core might be reversing its spin. It ‘won’t affect ...

    www.aol.com/earth-core-might-reversing-spin...

    “We infer the inner core rotation changes direction every 35 years,” Dr. Song told McClatchy News. Earth’s core might be reversing its spin. It ‘won’t affect our daily lives,’ expert says

  6. Earth’s Core Is ‘Moving Under Our Feet,’ Switching Direction ...

    www.aol.com/lifestyle/earth-core-moving-under...

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  7. We Know How Fast Earth Spins ... Don’t We? - AOL

    www.aol.com/lifestyle/know-fast-earth-spins-don...

    Earth rotates on its axis at about 1,000 miles per hour. That’s the short answer, but it’s not the whole story.

  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. Rotation period (astronomy) - Wikipedia

    en.wikipedia.org/wiki/Rotation_period_(astronomy)

    In astronomy, the rotation period or spin period [1] of a celestial object (e.g., star, planet, moon, asteroid) has two definitions. The first one corresponds to the sidereal rotation period (or sidereal day ), i.e., the time that the object takes to complete a full rotation around its axis relative to the background stars ( inertial space ).