...历书时（Ephemeris Time），描述天体运动的动力学方程中作为时间自变量所体现的时间，或天体历表中应用的时间。它是由天体力学的定律确定的均匀时间。
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N time that is based on the orbit of the earth around the sun rather than the axial rotation of the earth, one ephemeris second being 556 925.9747 of the tropical year 1900. It was used from 1960 to 1983 as an astronomical timescale but has been replaced by terrestrial dynamical time and barycentric dynamic time 历书时
Based on satellite ephemeris and time data of the satellite coordinates of the celestial coordinate system.
根据卫星星历和时间数据计算卫星在天球坐标系中的坐标。
Devices and methods are described for determining position information without broadcast ephemeris data for extended time periods.
描述了用于对延长的时间段确定位置信息而无需广播星历数据的设备和方法。
The broadcast ephemeris, which is the basic of satellite navigation, must be precise and real time.
卫星导航定位的基础，要求有较高的精度和实时性。
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