The date object is used to work with dates and times.

时间对象用来操作日期和时间。

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The resulting Date object will have its time portion set to midnight, of course.

(当然，产生的Date对象将把它自己的时间部分设置为午夜时刻)。

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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.

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。

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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.

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。

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