I consider it the chief duty of an astronomer to gather the observations of the heavenly bodies, and to explain their motions by hypotheses.
Heliocentric model of the solar system
I consider it the chief duty of an astronomer to gather the observations of the heavenly bodies, and to explain their motions by hypotheses.
Heliocentric model of the solar system
Preface to 'De Revolutionibus Orbium Coelestium'
1543
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