《明史·志·卷一》
也是二百五十里相差一度。用周天的度数来计算，得知地的全周是九万里。
以周天度计之，知地之全周为九万里也。
It is also a difference of one degree every two hundred and fifty li. Calculating using the degrees of the celestial sphere, we learn that the Earth's circumference is ninety thousand li.
<s>[INST] Translate to English, please: 以周天度计之，知地之全周为九万里也。 [/INST] It is also a difference of one degree every two hundred and fifty li. Calculating using the degrees of the celestial sphere, we learn that the Earth's circumference is ninety thousand li.</s>
Translate to English, please: 以周天度计之，知地之全周为九万里也。
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It is also a difference of one degree every two hundred and fifty li. Calculating using the degrees of the celestial sphere, we learn that the Earth's circumference is ninety thousand li.
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