Methods for CIP and CIO localisation
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The precession-nutation transformation describes the changing directions on the celestial sphere of the Earth's pole and an adopted origin of right ascension. The coordinate...
岁差章动变换(precession-nutation transformation)描述了地球极在天球(celestial sphere)上的指向变化,以及约定采用的赤经原点。坐标(coordinate)……



