《宋书·志·卷二十三》
浑天说失传，所以有宣夜、盖天说，此两种方法都很粗疏，因此后人没有记述。
浑文废绝，故有宣、盖之论，其术并疏，故后人莫述。
The theory of an armillary sphere has been lost, so there are theories of a revolving celestial sphere and a domed celestial sphere. These two methods are very crude, so later generations did not record them.
<s>[INST] Convert the following modern Chinese text into Classical Chinese: 浑天说失传，所以有宣夜、盖天说，此两种方法都很粗疏，因此后人没有记述。 [/INST] 浑文废绝，故有宣、盖之论，其术并疏，故后人莫述。</s>
Convert the following modern Chinese text into Classical Chinese: 浑天说失传，所以有宣夜、盖天说，此两种方法都很粗疏，因此后人没有记述。
user
浑文废绝，故有宣、盖之论，其术并疏，故后人莫述。
assistant