Skip to main content Accessibility help
×
Home

Reference Systems

  • Toshio Fukushima (a1)

Abstract

A reference system is a relation connecting observables and their mathematical represententions. The principle of general relativity assures that any sort of coordinate system can be used to describe physical phenomena. Thus, any reference system is only a convention. There is no absolutely true reference system. Instead, people seek for a best reference system, whose meaning may differ thus need to clarify. Taking an example from Earth rotation, we discuss how to find such a best reference system. The definition of the best system will change as scientific understandings deepen and computational environments develop. Therefore, we can not stop improving reference systems. However, when replacing an existing widely-spread system, one must take great care to minimize the inconvenience caused by its transition, especially the inconvenience which users might endure. The Standards Of Fundamental Astronomy (SOFA) project being conducted by the IAU WG on Astronomical Standards has the opportunity to ease this troublesome task. The World Wide Web (WWW) will be a main device to realize the project, namely to provide working standards including reference systems to the world.

    • Send article to Kindle

      To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

      Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

      Find out more about the Kindle Personal Document Service.

      Reference Systems
      Available formats
      ×

      Send article to Dropbox

      To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

      Reference Systems
      Available formats
      ×

      Send article to Google Drive

      To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

      Reference Systems
      Available formats
      ×

Copyright

References

Hide All
Capitaine, N.: 1996, “Precession-Nutation: Theory, determinations and analysis”, Earth Rotation, Reference Systems in Geodynamics and Solar System, Journées 1995 (N.Capitaine, , Kolaczek, B., Debarbat, S., eds), Warsaw, 3944.
Fukushima, T.: 1995, “Report of the IAU WGAS subgroup on standard procedures”, Highlights of Astronomy 10.
HMNAO and USNAO: 1961, Explanatory Supplement to the Astronomical Ephemeris and the American Ephemeris and Nautical Almanac, HM Stationery Office, London.
Hughes, J.A., Smith, C.A., and Kaplan, G.H. (eds): 1991, Reference Systems, IAU Col-loguium 127, U.S. Naval Observatory, Washington, DC.
Kovalevsky, J., Mueller, I.I., and Kolaczek, B. (eds): 1989, Reference Frames in Astronomy and Geophysics, Kluwer, Dordrecht.
McCarthy, D.D. (ed.): 1989, “IERS Standards (1989)” IERS Tech. Note 3, Obs. de Paris.
McCarthy, D.D. (ed.): 1992, “IERS Standards (1992)” IERS Tech. Note 13, Obs. de Paris.
McCarthy, D.D. (ed.): 1996, “IERS Conventions (1996)” IERS Tech. Note 21, Obs. de Paris.
Seidelmann, P.K. (ed.): 1992, Explanatory Supplement to the Astronomical Almanac, Univ. Science Books, Mill Valley, CA.

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed