主章动常数和对它的天文实测

Primary Nutational Constants and Their Determination by Astronomical Observation

本文列举了最近以来,光学天文、VLBI和LLR等技术对主章动常数的测量结果,结果表明对国际天文学联合会(IAU)在1982年通过的1980 IAU章动理论应予以修正。文中强调了现代天文实测工作应该在地球模型和章动理论的研究中起到更大的作用;还讨论了在实际进行主章动常数测量工作时应该注意的一些问题。

Recent determinations of primary nutational constants by astrometric, VLBI, and LLR techniques are introduced in the paper. It can be seen that a modification of 1980 IAU Natation Theory, which was adopted by the IAU in 1982, is needed now. It is stressed that the new results derived by astronomical observation should also be taken into account in the studies of Earth model and nutation. Some practical problems about the determination of primary nutation are also discussed in the paper.