Space-Time Reference Frames

  • Pierre Léna
  • François Lebrun
  • François Mignard
Part of the Astronomy and Astrophysics Library book series (AAL)


An essential part of astrophysical observation consists in measuring the positions of astronomical objects and in dating events. Obtaining the photometric magnitudes of the emitted radiation is not enough; the position of its source must also be determined to great accuracy, for spatial resolutions of the order of several tenths of a millisecond of arc can now be attained, and this tendency is certain to continue (cf. Chap. 4). In terms of sensitivity, detectors can now measure the characteristics of phenomena whose time of variation is less than one millisecond. And further, extremely accurate time scales are required for space travel and exploration of specific sites in the solar system.


Proper Motion Practical Realisation Spatial Frame Julian Date Atomic Time 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag Berlin Heidelberg 1998

Authors and Affiliations

  • Pierre Léna
    • 1
  • François Lebrun
    • 2
  • François Mignard
    • 3
  1. 1.Observatoire de Paris-MeudonUniversité de Paris VIIMeudon Principal CedexFrance
  2. 2.Commissariat à l’Energie Atomique/SaclayDSM/DAPNIA/SApGif-sur-Yvette CedexFrance
  3. 3.Observatoire de la Côte d’AzurCentre de Recherche en Géodynamique et AstrométrieGrasseFrance

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