1.The Present paper deals with the basic conceptions of celestial sphere and celestial direction in the relativistic astrometry. The conceptual definitions and their mathematical expressions of the proper direction, the natural direction, the coordinate direction and the barycentric celestial direction, as well as the parallax, the aberration and the light deflection are given in the general metric form.
本文讨论了相对论天体测量学中有关天球和天体方向的基本概念，给出了本征方向、自然方向、坐标方向、质心天球方向和视差、光行差、光线引力偏折的概念性定义及其在一般度规形式下的数学表达式。
2.The maintenance of orientation of the international Earth Rotation Service(IERS)celestial reference frames from 1992 to 1995 are analyzed in this paper. In combination with the maintenance for years from 1988 to 1992, it is concluded that there are detectable variations in the orientation of IERS celestial reference frames from 1988 to 1995. The biggest shifts of the origin of right ascension and of the celestial pole are about 0. 4mas.
本文分析了1992年至1995年期间国际地球自转服务（IERS）天球参考架的指向维持情况，结合1988年至1992年的指向维持情况指出，该参考架在1988年至1995年期间历年的指向均存在显著变化，赤经零点和天极的最大年度漂移约为0．4mas。
3.The position of two celestial bodies on the celestial sphere when they have the same celestial longitude.
合两个天体在天球中处于同一天球经线的位置
4.(astronomy) the angular distance to a point on a celestial object measured north or south from the celestial equator; expressed in degrees; used with right ascension to specify positions on the celestial sphere.
（天文学）到达某天体一点的角距，从天体赤道向北或向南测量得出；用角度表示；同赤经共指定天体表面上的位置。
5.the great circle on the celestial sphere midway between the celestial poles.
环绕球形天体与地球类似的大圆。
6.(astronomy) the angular distance eastward along the celestial equator from the vernal equinox to the intersection of the hour circle that passes through the body; expressed in hours and minutes and second; used with declination to specify positions on the celestial sphere.
（天文学）从穿越地球的时圈的交叉点到春分点的顺着天体赤道向东的角距离；用时、分、秒来表示；同赤纬一起指定天球上的位置。
7.The passage of a celestial body across a line between an observer and another celestial object, as when the moon moves between the earth and the sun in a solar eclipse.
掩星现象天体运行穿过观察者和另一天体连线，如日食时，月球移动到地球和太阳之间
8.A configuration in which the position of one celestial body is90= from another celestial body, as measured from a third.
方照一种布局，其中某天体的位置与另一天体成90度，如从第三天体测量
9.Either half of the celestial sphere as divided by the ecliptic, the celestial equator, or the horizon.
半天球被黄道，天赤道或地平圈分成两半的天球的一半
10.The angular distance to a point on a celestial object, measured north or south from the celestial equator.
赤纬到达某天体一点的角距，从天体赤道向北或向南测量得出
