Summer is amber land under a sky of blue.

夏季这里都是琥珀色蓝天下的土地。

youdao

The blue of the sky paled to a light grey.

天空的蓝色渐变成了浅灰色。

《牛津词典》

Her silk shirt dress was sky-blue, the colour of her eyes.

她穿的真丝衬衫是天蓝色的，和她双眸的颜色一样。

《柯林斯英汉双解大词典》

The curving brushstrokes of Van Gogh's expressive sky look like explosions of blue fire.

VOA: special.2010.03.24

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

The Cumberland Mountains of Tennessee rose blue-gray in the afternoon sky.

VOA: special.2009.11.14

Instead, again with data as crystal clear as an azure sky of deepest blue, the report identifies potential root causes in intellectual property, business practice and unforeseen technical challenges as playing a significant role, along with some areas where the FDA could help foster drug development.

FORBES: The Death Of The Blockbuster Drug: A Cheat Sheet

Season ticket sales, currently at less than 700, figure to fall short of Sky Blue's pre-recession goal of 1, 000 seats.

FORBES: Magazine Article

But there was a band of blue sky just above the gray, the blue you see in tropical postcards, the blue of the Mediterranean.

NEWYORKER: Beginners