A heliocentric system was counter to long

A heliocentric system was counter to long -...

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A heliocentric system  was counter to long-established belief and seemed unimaginable to many. This  is why Copernicus wrote in the preface to his book that he had "hesitated long whether I should give to  the light these my Commentaries written to prove the Earth's motion." His friends, though, had "often  urged and even importuned me to publish this work." Copernicus hoped that "my labors contribute  somewhat even to the Commonwealth of the Church. .. For not long since the question of correcting the  ecclesiastical calendar was debated."  Indeed, for centuries, the difficult question of calculating the dates of future Easters had been a main  motive of astronomical observations and calculations. In Copernicus's system  the rotation of the Earth caused the stars' observed motion, rather than the  rotation of the sphere of the stars. So the starry sphere was obsolete. 
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This note was uploaded on 12/15/2011 for the course AST AST1002 taught by Professor Emilyhoward during the Fall '10 term at Broward College.

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A heliocentric system was counter to long -...

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