The speaker refers to the astronomer as 'learn'd' due to the lack of interest in the astronomer's knowledge.
The speaker calls the astronomer 'learn'd' because the astronomer possesses knowledge that doesn't interest the speaker. The poem 'When I Heard the Learn'd Astronomer' conveys a sense of disconnect between intellectual knowledge and personal experience. The speaker finds the astronomer's academic knowledge uninteresting and prefers a more direct, intuitive connection with the universe.
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