"He clasps the crag with crooked hands." Poems are riddled with figurative language, and The Eagle is no exception, personified objects and animals are the easiest way to relate to anybody. As if an eagle could have hands rather than the talons that birds are a custom to having. "Crooked hands." He's describing claws designed to grab fish and other smaller creatures but calls them hands to emphasize the dramatic and importance in the line.
“Close to the sun.” How close to the sun can you be? We’re billions