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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. Chandler wobble - Wikipedia

    en.wikipedia.org/wiki/Chandler_wobble

    The Chandler wobble or Chandler variation of latitude is a small deviation in the Earth's axis of rotation relative to the solid earth, [1] which was discovered by and named after American astronomer Seth Carlo Chandler in 1891. It amounts to change of about 9 metres (30 ft) in the point at which the axis intersects the Earth's surface and has ...

  4. Equatorial coordinate system - Wikipedia

    en.wikipedia.org/wiki/Equatorial_coordinate_system

    The fundamental plane and the primary direction mean that the coordinate system, while aligned with Earth's equator and pole, does not rotate with the Earth, but remains relatively fixed against the background stars. A right-handed convention means that coordinates increase northward from and eastward around the fundamental plane.

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

    www.aol.com/earth-tilted-31-5-inches-164500730.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. 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

  8. 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 ...

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