The gradual acceptance of the Copernican theory of the universeNote 31 — Chapter I · The Development of Astronomical Thought to 1400 A.D. A Preliminary Sketch of Early Theories as a Background.Reading editionDict. of Nat. Biog.◇Copy noteReturn to CHAPTER I. The Development of Astronomical Thought to 1400 A.D. A Preliminary Sketch of Early Theories as a Background.