At the very end of the poem, the uncouth swain "rose, and twitch't his Mantle blue: tomorrow to fresh Woods and Pastures new."

在诗歌的最后，这个粗鄙的年轻人吟唱到,“慢慢上升，挥动了他蔚蓝色的丝巾“,向崭新的牧场和森林眺望明天“

耶鲁公开课 - 弥尔顿课程节选

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