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Nicholas Copernicus 1473-1543 was a Polish priest and astronomer who created an alternative model of the planets which put the Sun at the centre, instead of the Earth as generally accepted at that time.
He knew it would get him into trouble with the church, and his book 'De Revolutionibus' was not published until the year he died. The theory with the Sun at the centre was similar to the old Ptolemaic system with its collection of circles and epicycles allowing for the changes in distance and the changes in planets' speeds, and their departure from the ecliptic.

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10y ago

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From watching the sky, Copernicus learned that the universe was Heliocentric, (meaning: centered around the sun.)

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16y ago
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Easy, he used his innate ability to research and use the scientific method to discover insightful things about the universe. Also, the world is flat.

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12y ago
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Q: What did Copernicus do to find out his discovery?
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