The IAU 2000A precession-nutation theory relates the International Celestial
Reference Frame to the International Terrestrial Reference Frame and has been
effective since January 2003. In 2006, the IAU moved to adopt a more dynamically
consistent precession model to complement the IAU 2000A nutation theory. This update – described as IAU 2006 precession in the 2009 Astronomical Almanac – is effective January 2009.
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GIS Weekly Magazine
Susan Smith
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Look for the next issue of GIS Weekly Magazine on May 28, 2012.
Each GISWeekly Review delivers to its readers news concerning the latest developments in the GIS industry, along with a selection of other articles that we feel you might find interesting. |
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