This man declined an invitation to advise the Fifth Lateran Council on calendar reform, and his   observation of an eclipse of Aldebaran helped him determine the diameter of the Moon.
This man declined an invitation to advise the Fifth Lateran Council on calendar reform, and his   observation of an eclipse of Aldebaran helped him determine the diameter of the Moon. The seven  assumptions of the model in this man's Little Commentary  includes the belief in perfect, circular   orbits, though the evidence gathered in his On the Revolutions of the Celestial Spheres  was used  by Galileo to promote a change in the way people viewed the solar system. Arguing against the  Ptolemaic system of astronomy, name this Polish scientist who developed the heliocentric model of  the universe.
This man declined an invitation to advise the Fifth Lateran Council on calendar reform, and his   observation of an eclipse of Aldebaran helped him determine the diameter of the Moon.
Nicolaus Copernicus [or Mikołaj [MEE-koh-wye] Kopernik]