Analyze Whitman uses parallelism, the repetition of a grammatical structure, in lines 1-4. Describe what is parallel in these lines. What impression of the astronomer's lecture does the parallelism create?

The impression of the astronomer's lecture was that parallelism created was to create a sense of boredom.

It should be noted that parallelism simply means the repetition of the same grammatical form in the sentence. It's the matching of the words, phrases, or clauses within a sentence.

Based on the information given, the impression of the astronomer's lecture was that the parallelism created was to create a sense of boredom. The character gets bored and then went outside to see the beauty of the stars.

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The impression of the astronomer's lecture  create a sense of boredom.The character gets bored by the lecture and goes outside to see the beauty of the stars.

Explanation:

The lines form the Whitman poem When I Heard the Learn’d Astronomer are

When I heard the learn’d astronomer,

When the proofs,  the figures, were ranged in columns before me,

When I was shown the charts and diagrams, to add, divide, and measure them,

When I was sitting heard the astronomer where he lectured with much applause in the lecture-room,

Few Examples of Parallelism in the lines mentioned above are

The impression of the astronomer's lecture  create a sense of boredom.The character gets bored by the lecture and goes outside the class  to appreciate the beauty of the stars.