Positive Numbers will display calendar events to the right (or future) of the start date.
如果是正数，则将日程表事件显示到起始日期的右边(或将来)。
The standard date selector on the right side of the dialog allows you to enter the date and time for which the ground track display should start;
对话框左边的选择框用于输入所要显示的地面轨道的开始时间；
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