a map formed by the projection of a sphere or part of a sphere on a plane, especially an adjustable circular star map that shows the appearance of the heavens at a specific time and place 球体投影图;天体平面图
派生 planispheric [-ˈsfɛrɪk] adjective 语源
late Middle English planisperie, from medieval Latin planisphaerium, from Latin planus 'level' + sphaera 'sphere'; later influenced by French planisphère