scholarly journals The oceans and the Earth's rotation

1988 ◽  
Vol 128 ◽  
pp. 349-352
Author(s):  
P. Brosche
Keyword(s):  
Solid Earth ◽  
Earth’S Rotation ◽  
The Moon ◽  
Tidal Effects ◽  
Earth's Rotation ◽  
Tidal Friction ◽  
Long Run ◽  
Short Time ◽  
Tidal Variations ◽  
Observational Techniques

In the long run, the tidal interaction between the Moon and the solid Earth is mediated by the oceans. It produces the retardation of the Earth's rotation known as ‘tidal friction’. Due to the changing configuration of the continents, it is a non-monotonic function of time. Tides of the solid Earth dominate the short-periodic tidal effects while the exchange with the atmosphere is preponderant in climatic changes, especially with an annual signature. It is shown that the influences of the oceans within such short time-scales must be taken into account for tidal and for non-tidal variations as well if one wants to model the Earth's rotation at the cm-level corresponding to the most advanced observational techniques.

Long-term changes in the rotation of the Earth : 700 B.C. to A.D. 1980

1984 ◽  
Vol 313 (1524) ◽  
pp. 47-70 ◽  
Keyword(s):  
Earth’S Rotation ◽  
Earth's Rotation ◽  
Temporal Behaviour ◽  
Tidal Friction ◽  
The Past ◽  
The Earth ◽  
Tidal Changes ◽  
Rotation Of The Earth ◽  
Tidal Variations

Occultations of stars by the Moon, and solar and lunar eclipses are analysed for variations in the Earth’s rotation over the past 2700 years. Although tidal braking provides the dominant, long-term torque, it is found that the rate of rotation does not decrease uniformly as would be expected if tidal friction were the only mechanism affecting the Earth’s rotation. There are also non-tidal changes present that vary on timescales ranging from decades to millennia. The magnitudinal and temporal behaviour of these non-tidal variations are evaluated in this paper.

scholarly journals Historic Variations in the Rotation of the Earth

1972 ◽  
Vol 48 ◽  
pp. 160-161
Author(s):  
R. R. Newton
Keyword(s):  
Earth’S Rotation ◽  
The Moon ◽  
Earth's Rotation ◽  
Tidal Friction ◽  
The Past ◽  
The Earth ◽  
Rotation Of The Earth

The purpose of this work is to investigate changes in the rotation of the Earth in the past few thousand years. Since most available observations involve the Moon, study of the Earth's rotation is inseparable from study of the Moon's motion. Since it is doubtful that present theories of tidal friction account for the present acceleration (Spencer Jones, 1939; Van Flandern, 1970; Pariisky et al., 1972) of the Moon, we cannot safely assume that consequence of the theories which says that tidal friction has been almost constant.

Tidal friction and the earth's rotation

1981 ◽  
Vol 39 (1-2) ◽  
pp. 157-158
Author(s):  
William M. Kaula
Keyword(s):  
Earth’S Rotation ◽  
Earth's Rotation ◽  
Tidal Friction

scholarly journals Short-term tidal variations in UT1: compliance between modelling and observation

2009 ◽  
Vol 5 (H15) ◽  
pp. 215-215 ◽  
Author(s):  
Sigrid Englich ◽  
Harald Schuh ◽  
Robert Weber
Keyword(s):  
Solid Earth ◽  
Earth Tides ◽  
Time Interval ◽  
Observation Data ◽  
Length Of Day ◽  
Tidal Effects ◽  
Short Term ◽  
Solid Earth Tides ◽  
Oceanic Tides ◽  
Tidal Variations

AbstractThe Earth rotation rate and consequently universal time (UT1) and length of day (LOD) are periodically affected by solid Earth tides and oceanic tides. Solid Earth tides induce changes with periods from around 5 days to 18.6 years, with the largest amplitudes occurring at fortnightly, monthly, semi-annual and annual periods, and at 18.6 years. The principal variations caused by oceanic tides have diurnal and semi-diurnal periods. For the investigation of the tidal effects with periods of up to 35 days, UT1 series are estimated from VLBI observation data of the time interval 1984–2008. The amplitudes and phases of the terms of interest are calculated and the results for diurnal and sub-diurnal periods are compared and evaluated with tidal variations derived from a GNSS-based LOD time series of 8 months. The observed tidal signals are finally compared to the predicted tidal variations according to recent geophysical models.

scholarly journals Commission 19: Rotation of the Earth

1985 ◽  
Vol 19 (1) ◽  
pp. 193-205 ◽  
Author(s):  
Ya. S. Yatskiv ◽  
W. J. Klepczynski ◽  
F. Barlier ◽  
H. Enslin ◽  
C. Kakuta ◽  
...  
Keyword(s):  
Time Frame ◽  
Laser Ranging ◽  
Earth’S Rotation ◽  
The Moon ◽  
Earth's Rotation ◽  
The Earth ◽  
Long Time ◽  
Terrestrial Reference System ◽  
Rotation Of The Earth

During the period, work on the problem of the Earth’s rotation has continued to expand and increase its scope. The total number of institutions engaged in the determination of the Earth’s rotation parameters (ERP) by different techniques has been increased significantly. The rotation of the Earth is currently measured by classical astrometry, Doppler and laser satellite tracking, laser ranging of the Moon, and radio interferometry. Several long time series of the ERP are available from most of these techniques, in particular, those made during the Main Campaign of the MERIT project. The various series have been intercompared and their stability, in the time frame of years to days, has been estimated for the purposes of establishing a new conventional terrestrial reference system (COTES). On the other hand, the difficulties of maintaining a regular operation for laser ranging to the Moon (LLR) have been recognized. It resulted in the proposal to organize an one-month campaign of observations in 1985 in order to complement the COTES collocation program and to allow additional intercomparisons with other techniques.

Tidal friction and the Earth's rotation, II

1985 ◽  
Vol 115 (3-4) ◽  
pp. 355-356
Author(s):  
F.D. Stacey
Keyword(s):  
Earth’S Rotation ◽  
Earth's Rotation ◽  
Tidal Friction

Tidal friction and the earth's rotation

Icarus ◽  
1979 ◽  
Vol 40 (2) ◽  
pp. 315-316
Author(s):  
Anthony R. Dobrovolskis
Keyword(s):  
Earth’S Rotation ◽  
Earth's Rotation ◽  
Tidal Friction

scholarly journals On the Eclipse of Hipparchus

2019 ◽  
Vol 50 (1) ◽  
pp. 3-15
Author(s):  
Leslie V. Morrison ◽  
F. Richard Stephenson ◽  
Catherine Y. Hohenkerk
Keyword(s):  
Earth’S Rotation ◽  
The Moon ◽  
Earth's Rotation

We investigate the date of observation of the Hipparchus eclipse using our latest measurement of historical variations in the Earth’s rotation to plot the tracks of the potential eclipses. We conclude that Hipparchus most probably analysed the eclipse of −189 in deriving the distance to the Moon, as concluded by Toomer in 1974.

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