Which astronomer from Torun published a heliocentric theory in 1543?

Answer and explanation

Correct answer: A. Nicolaus Copernicus

  1. Step 1: Copernicus's book On the Revolutions of the Heavenly Spheres placed the Sun at the centre of the system. Answer: Nicolaus Copernicus. Why not the others: Johannes Hevelius, Tycho Brahe and Galileo Galilei don't fit.

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