太阳一年内的轨迹形成这种形状是因为地球围绕着与太阳略微不同的轴旋转，而我们的地球也沿着椭圆形轨道运行。
The sun makes this shape over a year because Earth rotates on a slightly different axis than the sun, and our planet also travels on an elliptical orbit.
这一增长轨迹与美国的情况形成了鲜明的对比。
This trajectory contrasts sharply with what has happened in America.
当然用装在三角架上的照相机固定摄影，长时间曝光能拍到星星因地球自转而形成的同心圆轨迹。
Of course, with the camera fixed to a tripod, the stars themselves produce concentric trails in long exposures, a reflection of the Earth's rotation around its axis.
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