The sun had barely risen, but the line outside of the Apple store in Bethesda,Maryland already stretched around the block.

VOA: standard.2010.04.03

Maybe it could refer to either the poet or the sun throughout the entire line, if you think of the mantle blue as being the actual sky that the sun is able to twitch over his shoulder.

或者两者皆可,从整句的行文看来，如果你们把蓝色的丝巾看作是真实的天空的话,那么太阳的确是能够在他的肩上轻轻颤动。

耶鲁公开课 - 弥尔顿课程节选

Now we learn, of course, by the second half of this line ; that it has to be the uncouth swain who rose and twitched his mantle blue; but for a moment the "he" in line 192 seems to be able to refer to either the poet or the sun.

现在我们要学习这句话的第二部分,这里的太阳指代的是那个年轻人;,但是某一刻，在192行的“他“,似乎指的是诗人自己亦或是太阳本身。

耶鲁公开课 - 弥尔顿课程节选