The scheme can anticipate user's location by using ephemeris message.

该策略利用了星历信息的确定性来预计用户的位置。

The GPS Forecasting ephemeris is usually used to predict GPS satellite distribution.

GPS预报星历常用来预报未来一段时间内GPS卫星的分布情况。

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。

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。

We have to acquire the following "tools" to work with: an ephemeris for the year the horoscope is to be made.

我们必须在工作中使用“工具”，出生那年的一个星历表。