Ming-Tang, as an important Li-institution building, had a Ya-shape plan before Han dynasty, which originated from the universe mode of round sky with Ya-shape earth in ancient times.
明堂作为重要的礼制建筑，汉代以前平面为亚形，源自于上古时代天圆地亚形的宇宙观。
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.
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。
This projection provides data measured in meters across the globe, basing the shape of the earth on a sphere model.
这个投影基于地球的形状是球体模型的前提提供了以米测量的地球数据。
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