| Earth Rotation |
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Information AboutEarth Rotation |
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The Earth's rotation is the Rotation of the solid Earth around its own axis, which is called ''Earth's axis'' or ''rotation axis''. SPEED OF THE ROTATION The average Rotation Period of the Earth is called " Sidereal Day ", the actual value " Length Of Day (abbrev. LOD). Many people do not know that LOD is ''not'' 24 hours, but 1/365 shorter than "1 day": its value is 23 H 56 M 4,10 S and describes the rotation with respect to the cosmic Background of the stars. In contrast to this, the rotation with respect to the Sun is 24 hours, because we are revolving around the sun once per year. Per day the difference is 86 400 s / 365.25 = 236 seconds = 3 m 56 s (as can be seen above). Sidereal and Solar day (details) Special facts & reference problem AXIS OF THE ROTATION ... definition of the Earth Rotation Parameters (EOP) ... VARIATION OF LOD WITH TIME Short introduction into Gyro Physics Short periodic variations Long scale variations EFFECTS ON THE AXIS' DIRECTION Precession ... ''For a detailed description see the article Precession '' Nutation (a simple explanation is possible) Polar Motion and geophysical interrelations THE GEOLOGICAL HISTORY OF EARTH ROTATION WIKI- AND WEBLINKS LITERATURE (and sources of the figures) |