SOFA Tools for Earth Attitude
International Astronomical Union Standards Of Fundamental Astronomy SOFA Tools for Earth Attitude Software version 13. Document revision Version for C programming language 2017 July 13. MEMBERS OF THE IAU SOFA BOARD (2007). John Bangert United States Naval Observatory Wim Brouw University of Groningen Mark Calabretta Australia Telescope National Facility Anne-Marie Gontier Paris Observatory Catherine Hohenkerk Her Majesty's Nautical Almanac O ce Wen-Jing Jin Shanghai Observatory Zinovy Malkin Inst. Appl. Astron., St Petersburg Dennis McCarthy United States Naval Observatory Je rey Percival University of Wisconsin Patrick Wallace Rutherford Appleton Laboratory c Copyright 2007-16 International Astronomical Union.
4 2 CELESTIAL COORDINATES The precession of the ecliptic is caused by the in uence on the Earth’s orbital motion of the tidal forces from the planets. The ff is a slow (0 ′′:5 per year) secular rotation of the ecliptic about a slowly-moving diameter.
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