- How were IERS products changed on 1 January 2003?
- What new products were provided by IERS after 1 January 2003?
- What are the advantages of the new products distributed by the IERS?
- What are the pole angles X and Y?
- What is the ICRS?
- What is the ICRF?
- How does the ICRS differ from the FK5 system?
- How does the ICRF differ from the FK5 frame?
- What is the time argument for using IERS products?
- How is TT computed from TAI?
- What is the difference between TT and TCG?
- What is coordinate time?
- What is TCB (Temps-coordonnée barycentrique or Barycentric Coordinate Time)?
- What is the relationship between TCG and TCB?
- What is the CEO (Celestial Ephemeris Origin, sometimes called the NRO)?
- How was the CEO defined?
- What is the essential characteristic of the CEO?
- How is the CEO used?
- If a different point on the starting equator had been selected for the CEO, what would be changed?
- What is the path of the defined CEO?
- How does the new CIP (Celestial Intermediate Pole) differ from the CEP (Celestial Ephemeris Pole)?
- How does the new TEO (Terrestrial Ephemeris Origin) differ from the old origin of longitude on the true equator?
- What is the relationship between the TEO and the x-axis of the ITRS?
- How does the stellar angle theta (or Earth Rotation Angle) differ from GST?
- What information is required to determine the direction to a celestial object from a location on the Earth's surface with the best attainable a priori accuracy?
- How much is the accuracy of precession/nutation improved by MHB2000 and corrections to the precession constant and obliquity rate over the current IAU models?
- What is the limitation on the accuracy of the new models?
- What are the references for the new IAU precession and nutation models?
- What are the benefits (if any) of the new formulations for astrometry, for navigation, for astronomical data reduction, etc.?
- Where can the software for implementing the new formulations be found? What functions are available? When will the complete or partial software be ready?
- How can the existing nutation correction time series be converted to the new X, Y angles and vice versa?
- How are topocentric angles (hour angle/declination or azimuth/elevation) be derived from X, Y and theta?
