... 极限星等 limiting magnitude 极向扁率 polar flattening 极向恒星 pole-on star ...
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... 地球扁平率 flattening of the earth 极地扁平率 polar flattening 扁平棒 bar of flat ...
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In 1851 it was well known that Earth rotated: observational evidence included Earth's measured polar flattening and equatorial bulge.
1851年，众所周知，地球旋转：包括地球观测证据的测量极地和赤道扁平隆起。
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