The bulge of our spherical Earth blocks sunlight from the far hemisphere at the solstices; that same curvature allows the sun's rays to spread over more area near the top and bottom of the globe.
由于地球的球面形状，在至日突出的表面阻挡了阳光照射照远端的半球；同样是球面的原因，在至日阳光可以照射两极的更多地方。
The conclusion has been spread to spherical lens retroreflection array. The basic idea of the spherical lens retroreflector and its key points of application have been proposed.
并把此结论推广到球透镜逆反射阵列，提出球透镜逆反射器的基本概念及应用的要点。
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