清单 1 中的源代码给出了一个简单的例子，这个环境中中存在火星的地心引力，里面有一个球具有向上的速度。
The source example in Listing 1 shows a simple world with Mars' gravity and a sphere that currently has some upward velocity.
由于这个环境中具有地心引力，因此向上的速度不会坚持很久；最后这个球会上升到顶点并开始下降。
Given that the world has gravity, that upward velocity won't last long; eventually, the sphere reaches the apex and begins its descent.
目前的一些地心坐标向大地坐标的转换模型在计算速度，稳定性或精度方面存在一定的局限性。
At present, there is certain localization in some formulae of transformation from geocentric coordinates to geodetic coordinates, such as rate of calculation, stability, or precision.
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