'While thou drawest the blue curtains of the sky, scatter thy silver dew'
(To The Evening Star by William Blake)

What does the poet appeal thou to do?

The poet is asking "thou" to protect the earth through dew.

Explanation:

In the poem above, the word "thou" refers to the goddess venus whom the poet claims to protect the creatures of the land, allowing a silvery, protective and powerful dew to fall on all creatures when the god is distracted, drawing in the sky during the dawn.

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