《明史·志·卷七》
只是天实际上是圆体，与平行不同，旧历用的三差法，都是从勾股平行来确定的，和天体不合。
第天实圆体，与平行异类，旧所用三差法，俱从句股平行定者，于天体未合。
It's just that the sky is actually a circle, different from parallel. The three-difference method used in the old calendars is determined from right-angle triangles, which is not in line with celestial bodies.
<s>[INST] 对于下列每组文言文和现代汉语句子, 请提供一个能够准确表达两者本质的英语翻译: 文言文: 第天实圆体，与平行异类，旧所用三差法，俱从句股平行定者，于天体未合。 现代汉语: 只是天实际上是圆体，与平行不同，旧历用的三差法，都是从勾股平行来确定的，和天体不合。 [/INST] It's just that the sky is actually a circle, different from parallel. The three-difference method used in the old calendars is determined from right-angle triangles, which is not in line with celestial bodies.</s>
对于下列每组文言文和现代汉语句子, 请提供一个能够准确表达两者本质的英语翻译: 文言文: 第天实圆体，与平行异类，旧所用三差法，俱从句股平行定者，于天体未合。 现代汉语: 只是天实际上是圆体，与平行不同，旧历用的三差法，都是从勾股平行来确定的，和天体不合。
user
It's just that the sky is actually a circle, different from parallel. The three-difference method used in the old calendars is determined from right-angle triangles, which is not in line with celestial bodies.
assistant