In Hong Kong, the polar axis should point north and the elevation should be 22.5
在香港，极轴应指向天球北极，而仰角则为22。5度
Volume of Revolution Solid Formed by a Curved Sector Revolving around the Polar Axis in Polar Coordinates
极坐标系中曲边扇形绕极轴旋转的旋转体体积
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