1. contributions to astronomy
Although Copernicus" views on astronomy were made public in his book the year of his death, the geocentric view of the heavens did not give way to the heliocentric view. ... Around 1514 Copernicus distributed a little book, not printed but hand written, to a few of his friends who knew that he was the author even though no author is named on the title page. This book, usually called the Little Commentary, set out Copernicus's theory of a universe with the sun at its center. ... His contribution to astronomy was the second step to making Copernicus's heliocentric model of the universe...
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