Projective maps of southern and northern hemispheres are setup on rotatable interlocked subassemblies, which are installed on a base. The projective maps are obtained through following projective method: southern and northern hemispheres are divided along equatorial plane; shapes of warp and weft of southern and northern hemispheres are derived from normal zenithal projection; preconcerted reference point is on axis between northern earth pole and northern celestial pole; projective map of northern hemisphere is obtained through projection plane, and projective map of southern hemisphere is obtained from reflecting the projective plane. The invention emphasizes expressivity of each region in balance as well as spinning character of celestial body possessing the features of easy of viewing, visual and global integration.
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