Two-Line Orbital Element 又称为两行轨道数据 ; 利用两行轨道数据
Once the link between the element and the column is established, a blue line indicates the link between the two.
一旦元素与列之间建立链接，就可以看到一条蓝色的线，表明两者之间的链接。
The extra list element is actually added in line two of the append_options method.
额外的 list 元素实际上添加到 append_options 方法的第二行。
The SGP4 orbital forecast model is given. And the initial selection of two-line element is analyzed at the same time.
给出了SGP4解析轨道模型的具体形式，分析了双行元初值的选取方法。
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