Results 321 to 330 of about 170,968 (364)
Some of the next articles are maybe not open access.
Variations in the Rotation of the Earth
Science, 1984Variations in the earth's rotation (UT1) and length of day have been tracked at the submillisecond level by astronomical radio interferometry and laser ranging to the LAGEOS satellite. Three years of regular measurements reveal complex patterns of variations including UT1 fluctuations as large as 5 milliseconds in a few weeks.
Miao Lufeng +6 more
openaire +3 more sources
Annual Review of Earth and Planetary Sciences, 1988
The Earth's rotation is not constant. Instead, both the rate of rotation and the position of the rotation axis vary with time. Changes in the rotation rate are directly proportional to changes in the length of a day (LOD). In addition, the time integral of the LOD variability is proportional to fluctuations in Universal Time, the measure of time as ...
openaire +2 more sources
The Earth's rotation is not constant. Instead, both the rate of rotation and the position of the rotation axis vary with time. Changes in the rotation rate are directly proportional to changes in the length of a day (LOD). In addition, the time integral of the LOD variability is proportional to fluctuations in Universal Time, the measure of time as ...
openaire +2 more sources
1988
During the period, there have been several major events which have effected the scope and interest of Commission 19. The most significant of these has been the dissolution of the B1H and IPMS and their replacement by the International Earth Rotation Service (IERS).
W. J. Klepczynski +14 more
openaire +2 more sources
During the period, there have been several major events which have effected the scope and interest of Commission 19. The most significant of these has been the dissolution of the B1H and IPMS and their replacement by the International Earth Rotation Service (IERS).
W. J. Klepczynski +14 more
openaire +2 more sources
Science, 1991
Recent improvements in geodetic data and practical meteorology have advanced research on fluctuations in the Earth's rotation. The interpretation of these fluctuations is inextricably linked with studies of the dynamics of the Earth-moon system and dynamical processes in the liquid metallic core of the Earth (where the geomagnetic field originates ...
J. O. Dickey, Raymond Hide
openaire +3 more sources
Recent improvements in geodetic data and practical meteorology have advanced research on fluctuations in the Earth's rotation. The interpretation of these fluctuations is inextricably linked with studies of the dynamics of the Earth-moon system and dynamical processes in the liquid metallic core of the Earth (where the geomagnetic field originates ...
J. O. Dickey, Raymond Hide
openaire +3 more sources
1977
The President opened the meeting and invited R. Anderle to report on polar motion determined by Doppler satellite observations. The speaker said that the standard error in pole positions from 48 hours of Doppler observations was only 7 cm. However, because of uncertainties in the gravity field the standard deviation was 60 cm.
Edith A. Müller, Arnost Jappel
openaire +2 more sources
The President opened the meeting and invited R. Anderle to report on polar motion determined by Doppler satellite observations. The speaker said that the standard error in pole positions from 48 hours of Doppler observations was only 7 cm. However, because of uncertainties in the gravity field the standard deviation was 60 cm.
Edith A. Müller, Arnost Jappel
openaire +2 more sources
Reviews of Geophysics, 1987
Studies of the earth's rotation provide one of the best means of probing the interactions of the atmosphere, oceans, and solid earth as well as the structure of the core and mantle. Since the last report of the U.S. National Report to the IUGG [Tapley, 1983], two developments have led to significant improvement in the measurement of the rotation: the ...
openaire +2 more sources
Studies of the earth's rotation provide one of the best means of probing the interactions of the atmosphere, oceans, and solid earth as well as the structure of the core and mantle. Since the last report of the U.S. National Report to the IUGG [Tapley, 1983], two developments have led to significant improvement in the measurement of the rotation: the ...
openaire +2 more sources
Reviews of Geophysics, 1991
Earth rotation studies are reviewed for the 1987-1990 time period. It is noted that the emphasis in these studies has shifted from improvements in the observational techniques to interpreting and gaining greater understanding of the variations of the earth rotations.
openaire +2 more sources
Earth rotation studies are reviewed for the 1987-1990 time period. It is noted that the emphasis in these studies has shifted from improvements in the observational techniques to interpreting and gaining greater understanding of the variations of the earth rotations.
openaire +2 more sources
, 1973 The past three years have been marked by steady improvements in the utilisation of classical techniques employing conventional optical instruments such as PZT, astrolabe and transit instrument. There has also been a rapidly growing interest in the investigation of relationships between the astronomically-observed motions of the Earth and the data ...
openaire +1 more source
Earthquakes and the Rotation of the Earth
Science, 1974A correlation exists between long-term variations in the length of the day, Chandler wobble amplitudes, and global seismic activity. These variations may be partially due to climatic changes and ultimately to explosive volcanic activity.
openaire +4 more sources
1994
Motion is the subject to be discussed here: “latio” or forward motion will be the subject of the following Chapter.
openaire +2 more sources
Motion is the subject to be discussed here: “latio” or forward motion will be the subject of the following Chapter.
openaire +2 more sources