Pictured above is a series of images digitally stacked so that all of the stars images coincide. Here, Mars appears to trace out a loop in the sky.
上面图是一系列数码照片叠加而成的，让恒星重合，而火星貌似在天空中画了一个环。
The problem arose because astronomers had noticed that some planets in the sky seemed to stop, move backward and then go forward in a loop. Others appeared brighter at times and less bright at others.
这样，问题就来了，因为天文学家以前发现过，天上有些行星停顿下来，往后移动，然后再成环状向前移动，而其他行星看上去有时亮些，有时又不怎么亮。
The problem arose because astronomers had noticed that some planets in the sky seemed to stop, move backward and then go forward in a loop.
这个问题也就产生了，因为天文学家已经发现有些行星在天空似乎停止，向后移动，然后在一个循环。
Moreover, the sun position in the sky is obtained by astronomic algorithms in the case of open loop.
由天文历法来计算太阳在天空中的位置。
The problem arose because astronomers had noticed that some planets in the sky seemed to stop, move backward and go forward in a loop.
这样，问题就来了，因为天文学家以前发现过，天上有些行星停顿下来，往后移动，然后再成环状向前移动。
The problem arose because astronomers had noticed that some planets in the sky seemed to stop, move backward and go forward in a loop.
这样，问题就来了，因为天文学家以前发现过，天上有些行星停顿下来，往后移动，然后再成环状向前移动。
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