Walt Whitman: "When I Heard the Learn'd Astronomer"

          When I Hear the Learn'd Astronomer is a poem about the narrators reaction to hearing one teach about astrology. He is in a lecture, being taught by a smart learn'd astronomer about complicated things. He teaches about proofs, figures, charts, diagrams, and how to add, divide and measure them. Finally after being taught these things he felt sick and tired, and took a walk outside. When he got outside he looked at the stars in the sky and realized how beautiful it is.
          This poem could mean many different things. However, the main lesson it is teaching that the best way to learn something is to experience it. The narrator was taught by a smart guy many useful things, however he was not at peace until he went outside and experienced the night sky for himself. Furthermore When I Hear the Learn'd Astronomer shows you that sometimes learning through professors, charts, lectures, and diagrams is not always the most effective way; rather learning through experience has more of an impact on one.This connects with Paulo Freire and his outlook on Problem Posing education, which says that teaching shouldn't just be about teachers telling you what you ought to know and think, but one thinking for themselves.

Question: Why did he become sick?