Long-term fluctuations in the Earth’s rotation: 700 BC to AD 1990

1995 ◽  
Vol 351 (1695) ◽  
pp. 165-202 ◽  
Keyword(s):  
High Precision ◽  
Arab World ◽  
Earth’S Rotation ◽  
Precision Data ◽  
Earth's Rotation ◽  
High Precision Data ◽  
Answering Questions

Records of solar and lunar eclipses in the period 700 BC to AD 1600, originating from the ancient and medieval civilizations of Babylon, China, Europe and the Arab world, are amassed and critically appraised for their usefulness in answering questions about the long-term variability of the Earth’s rate of rotation. Results from previous analyses of lunar occupations in the period AD 1600-1955.5, and from high-precision data in AD 1955.5-1990, are included in the dataset considered in this paper.

scholarly journals The Variation of UT from 700 BC to the Present

1995 ◽  
Vol 10 ◽  
pp. 258-258
Author(s):  
F.R. Stephenson ◽  
L.V. Morrison
Keyword(s):  
High Precision ◽  
Arab World ◽  
Precision Data ◽  
High Precision Data ◽  
Answering Questions

AbstractRecords of solar and lunar eclipses in the period 700 BC to AD 1600 originating from the ancient and medieval civilisations of Babylon, China, Europe and the Arab world are amassed and critically appraised for their usefulness in answering questions about the long-term variability of the Earth’s rate of rotation. Results from previous analyses of lunar occultations in the period AD 1600-1955.5 and from high-precision data in AD 1955.5-1990 are included in the dataset considered in this paper.

Long-term electromagnetic core–mantle coupling and the Earth’s rotation acceleration in the Mesozoic Era

2012 ◽  
Vol 53 (5) ◽  
pp. 491-499
Author(s):  
Weijia Zhang ◽  
Yuanlin Sun ◽  
Neil Kelley ◽  
Yang Lei ◽  
Hangjie Yu
Keyword(s):  
Earth’S Rotation ◽  
Earth's Rotation

scholarly journals Transit-period search from single-event space-based data: the role of wide-field surveys

2019 ◽  
Vol 625 ◽  
pp. A145
Author(s):  
Geza Kovacs
Keyword(s):  
High Precision ◽  
Wide Field ◽  
Precision Data ◽  
Frequency Spectra ◽  
Transiting Planets ◽  
High Precision Data ◽  
Space Data ◽  
Signal Search

We investigate the optimization of dataset weighting in searching for the orbital period of transiting planets when high-precision space-based data with a single transit event are combined with (relatively) low-precision ground-based (wide-field) data. The optimization stems from the lack of multiple events in the high-precision data and the likely presence of such events in the low-precision data. With noise minimization, we combined two types of frequency spectra: (i) spectra that use two fixed transit parameters (moment of the center of the transit and duration of the event) derived from the space data alone; (ii) spectra that result from the traditional weighted box signal search with optimized transit parameters for each trial period. We used many mock signals to test the detection power of the method. Marginal or no detections in the ground-based data may lead to secure detections in the combined data with the above weighting. Depending on the coverage and quality of the ground-based data, transit depths of ~0.05% and periods up to ~100 days are accessible by the suggested optimum combination of the data.

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.

Fundamental components of the parameters of the Earth’s rotation in forming high-precision satellite navigation

2015 ◽  
Vol 53 (2) ◽  
pp. 143-154 ◽  
Author(s):  
Yu. G. Markov ◽  
M. V. Mikhaylov ◽  
I. I. Lar’kov ◽  
S. N. Rozhkov ◽  
S. S. Krylov ◽  
...  
Keyword(s):  
High Precision ◽  
Satellite Navigation ◽  
Earth’S Rotation ◽  
Earth's Rotation
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