What do the Hadley and Walker circulations have in common?

In one of the poems we read for this class, a dead speaker believes her dog to be digging on her grave because of its loyalty. However, she finds out that the dog is only digging on her grave to bury a bone and really had forgotten about its dead owner. What literary device is this an example of? 

Guido da Montefeltro

“I grow old. … I grow old …             I shall wear the bottoms of my trousers rolled.             Shall I part my hair behind?  Do I dare to eat a peach?              I shall wear white flannel trousers, and walk upon the beach.              I have heard the mermaids singing, each to each.             I do not think that they will sing to me.   I have seen them riding seaward on the waves Combing the white hair of the waves blown back When the wind blows the water white and black. We have lingered in the chambers of the sea By sea-girls wreathed with seaweed red and brown Till human voices wake us, and we drown.”

“In the room the women come and go / Talking of Michelangelo.”

Who does Dylan Thomas address specifically in the poem we read by him?

Two women spinning black wool

“Rage, rage against the dying of the light.”

North Richmond Street (in addition to identifying the work and author and saying what it is, what is symbolic about it?)

“A terrible beauty is born.”