选择一个初始的起点。

Choose an initial starting point,.

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要显示一个物体的轨迹，按照你要观察的轨迹起点日期新建一张星图，并在星图上选择这个天体。

To display an object track, draw a map for the time and date of the start of the track, and locate the object on the map.

youdao

要显示一个物体的轨迹，按照你要观察的轨迹起点日期新建一张星图，并在星图上选择这个天体。

To display an object track, draw a map for the time and date of the start of the track, and locate the object on the map.

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