Titlebook: Reference Frames; In Astronomy and Geo Jean Kovalevsky,Ivan I. Mueller,Barbara Kolaczek Book 1989 Kluwer Academic Publishers 1989 artificia

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The Earth’s Variable Rotation: Some Geophysical Causesomers and geophysicists for more than 100 years. The reason for this is quite clear when one becomes aware of the range of processes that perturb the Earth from uniform rotation (Figure 1). A complete understanding of the driving mechanisms requires a study of the deformation of the solid Earth, of

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Intercomparisons Between Kinematic and Dynamical Systemsal satellites; very-long-baseline interferometry (VLBI) observations of galactic and extra-galactic radio sources and of spacecraft; radio tracking of satellites; radar ranging to planets; and spacecraft tracking during planetary encounters. The accuracy of these measurements has reached a new miles

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Relativistic Theory of Celestial Reference Frames quantities into astronomical ephemeris. For example, in ephemeris astronomy, in order to use the well-known numerical planetary and lunar theories of motion DE-200/LE-200 referred to the barycentric coordinate time it is necessary to take into account the type of the space-time coordinates inherent to these theories.

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Extragalactic Reference Framesavoiding one of the chief complications of the stellar reference frame discussed in Chapter 1. The realization of such a reference frame, however, has been dependent on scientific discovery, technological advances, and commitment of resources to a now perceived need.

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