Earth Rotation

Some articles on earth, rotation, earth rotation:

Sidereal Time - Precession Effects
... The Earth's rotation is not a simple rotation around an axis that would always remain parallel to itself ... The Earth's rotational axis itself rotates about a second axis, orthogonal to the Earth's orbit, taking about 25,800 years to perform a complete rotation ... Because of this precession, the stars appear to move around the Earth in a manner more complicated than a simple constant rotation ...
Earth's Rotation - Rotation Period - Stellar and Sidereal Day
... Earth's rotation period relative to the fixed stars, called its stellar day by the International Earth Rotation and Reference Systems Service (IERS), is 86,164.098 903 691 ... Earth's rotation period relative to the precessing or moving mean vernal equinox, misnamed its sidereal day, is 86,164.090 88 ... seconds of mean solar time (UT1) (23 56 4.090 832. 88, 0.997 ...
Earth's Rotation
... Earth's rotation is the rotation of the solid Earth around its own axis ... The Earth rotates towards the east ... As viewed from the North Star Polaris, the Earth turns counter-clockwise ...
Apache Point Observatory Lunar Laser-ranging Operation - Principles of Operation - Modeling Station Locations
... what is really wanted is the distance between the center of mass of the Earth and the center of mass of the Moon ... But for the Earth, the stations move quite a bit on this scale The Earth's polar axis moves and the Earth's rotation is irregular ... axis moves due to various causes, some predictable (the Moon exerts a torque on Earth's tidal bulge) and some variable (rocks are rebounding from the last ice age, weather) ...

Famous quotes containing the words rotation and/or earth:

    The lazy manage to keep up with the earth’s rotation just as well as the industrious.
    Mason Cooley (b. 1927)

    till seven years were gane and past,
    True Thomas on earth was never seen.
    Unknown. Thomas the Rhymer (l. 79–80)