Read and analyze "when i heard the learn'd astronomer" by walt whitman. what romantic ideas does it express, and how does the structure of the poem reinforce the meaning?

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 the diagrams, to add, divide, and measure them;
when i, sitting, heard the astronomer, where he lectured with much applause in the lecture-room,
how soon, unaccountable, i became tired and sick;
till rising and gliding out, i wander’d off by myself,
mystical moist night-air, and from time to time,
look’d up in perfect silence at the stars.