earth rotation

earth rotation

[¦ərth rō¦tā·shən]
(astronomy)
Motion about the earth's axis that occurs 365.2422 times over a year's period.
References in periodicals archive ?
Studies will be coordinated by ITU along with international organizations such as the International Maritime Organization (IMO), the International Civil Aviation Organization (ICAO), the General Conference on Weights and Measures (CGPM), the International Committee for Weights and Measures (CIPM), the International Bureau of Weights and Measures (BIPM), the International Earth Rotation and Reference Systems Service (IERS), the International Union of Geodesy and Geophysics (IUGG), the International Union of Radio Science (URSI), the International Organization for Standardization (ISO), the World Meteorological Organization (WMO), and the International Astronomical Union (IAU).
Geophysicist Chopo Ma, of the International Earth Rotation and Reference Systems Service, said: "More and more leap seconds will be called for but we can't say one will be needed every year.
Dr Helal Al Kaabi, executive director of EMI explained: "Our latest move to add a leap second to the UAE standard time follows a decision by the International Earth Rotation and Reference Systems Service in January 2015 to add a leap second to Coordinated Universal Time at the end of June this year".
Though it all sounds a little pointless, the extra second, which was announced on Monday by the International Earth Rotation and Reference Systems Service, will be enacted to help account for Earth's slowing rotation.
The International Earth Rotation and Reference Systems Service said the leap second was added to account for the small difference in time between the rotation of the globe and the atomic clocks, reports (https://au.
This was established by detecting times delays between wave forms of 10-20 seconds for travel times Adelaide to London, and Perth to London, with that travel time variation following the earth's rotation with respect to the RA and Dec that had been reported in earlier experiments [4,5], and which displayed the sidereal effect, viz the earth time of the earth rotation phase was essentially fixed relative to sidereal time, i.
Every time the discrepancy between TAI and UT1 becomes too big, the International Earth Rotation and Reference Systems Service (IERS) jumps into action and announces a "leap second" - usually several months in advance.
The two mesh with lovely accuracy; the problem is that the length of day is infinitesimally slowing - and so once in a while, when the International Earth Rotation and Reference System Service decrees - most recently on Dec.
They discuss time before the 20th century, solar time, ephemerides, variable earth time, earth rotation and polar motion, ephemeris time, relativity and time, dynamical and coordinate time scales, clock developments, microwave atomic clocks, optical atomic standards, the definition and role of a second, international atomic time, coordinated universal time, time in the solar system, time and frequency transfer, modern earth orientation, international activities, time applications, and the future of timekeeping.
It has been ordered by the International Earth Rotation and Reference Systems Service in Paris.
For the 23rd time since 1972, the International Earth Rotation and Reference System Service added an extra second to the time standard, a worldwide network of some 200 atomic clocks.
So did you make the most of the extra leap second of 2005 - kindly donated by the boffins at the International Earth Rotation and Reference Systems Service?

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