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地球是圆的还是椭圆的？

Image created by Reto Stöckli, Nazmi El Saleous, and Marit Jentoft-Nilsen, NASA GSFC https://earthobservatory.nasa.gov/images/885/earth-from-space
Image created by Reto Stöckli, Nazmi El Saleous, and Marit Jentoft-Nilsen, NASA GSFC https://earthobservatory.nasa.gov/images/885/earth-from-space
 
需要用数据证明。（暂时没找到数据）
 
大地水准面 | Wikiwand
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大地水准面 | Wikiwand
https://www.wikiwand.com/zh/%E5%A4%A7%E5%9C%B0%E6%B0%B4%E5%87%86%E9%9D%A2
大地水准面 | Wikiwand
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