Thought of the Day

Today, one of the meanings of the word revolution is a sudden or dramatic transformation, but that has not always been the case. When Copernicus used the word in his 1543 publication of ‘De revolutionibus orbium caelestium’ it had the simple astronomical meaning of circular movement – revolving. But his idea that the earth was not the center of the universe, but revolved around the sun, was undoubtedly a dramatic transformation of understanding. It did not progressively build on previous ideas, but invalidated much of what was believed up to that stage.

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