1949．0至1979．0 ILS地极坐标的均匀化

自１９８４年起在天文计算中都采用ＦＫ５基本星表和新天文常数，这些变动直接影响了用天顶仪等光学仪器观测订定的地极坐标。本文论述了基本星表和天文常数变动后，对国际纬度服务（ＩＬＳ）订定的地极坐标的影响。结果表明：１）星表系统差对地极坐标的影响在ｘ和ｙ方向最大，分别约－０．００６”和－０．００４”；２）章动序列变动的影响在ｘ、ｙ方向最大波动分别为０．０１２”和０．０１０”。

Uniformity of The ILS Coordinates of Pole from 1949. 0 to 1979. 0

Since 1984s the FK5 fundamental catalogue and the new astronomical constants were used in the astronomical calculations. Due to these changes they will directly effect the coordinates of pole determined by the observationalresults with the optical instruments. for example the zenith telescope. In this paper the influences of the changes of fundamental catalogue and astronomical constants on the coordinates of pole obtained by meas of the international Latitude Service (ILS) were discussed. The results show that (1) the maximum effects of the systematic differences of the catalogue for the coordinates of pole are about -0. 006" and - 0. 004" on the x-component and y-component respectively:(2) the maximum fluctuations of the changes of nutation series are 0. 012" and 0. 010" on the x-component and y-component respectively.