假設大地為橢圓球形,長半徑比短半徑要長...之二
1 year ago
59
假設大地為橢圓球形,南北極半徑為6357公里,我們將標準鏡頭的攝影機置於離地表240000英尺之處;即海拔73.152公里之高度,在此等條件下,應該在地表的任一點上都會看到曲線。但我們真地乘飛行器到此高度時卻發現,大地的邊緣即地平線仍然是直線一條,並無肉眼可觀察到的曲率(curvature)。
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