Eavesdrop; and hear the incline of sunshine
A continuation of the 5 lines before this one where he is describing a peaceful almost picture perfect outside landscape. (he says it is his minds landscape meaning his mind is serene, calm, tranquil, peaceful,etc). In fact if you take a listen to him you can almost see the sun vividly setting across the horizon since words are formed from his brain (and his brain is the out doors environment he has talked about). Since your eavesdropping your listening to his words which is the sun to his brains landscape. His words (the sun) is the final majestic by product of his brain (the landscape he has gotten us to imagine). Also the sun is bright this could mean his words or vocabulary is bright (as in intelligent).
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