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How many recorded astronomical observations by Nicolaus Copernicus are known?
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Nicolaus Copernicus
Portrait of Nicolaus Copernicus, 1580, from the Town Hall in ToruÅ, Poland; in the collection of Muzeum OkrÄgowe w Toruniu (Regional Museum in ToruÅ). In his book De revolutionibus, he proposed that the Sun was the center of the solar system and that the planets circle the Sun.
There are 27 recorded astronomical observations known from the entire life of Nicolaus Copernicus. While it is certain that he made more than this number, these 27 are the only ones currently documented, consisting primarily of observations regarding eclipses, conjunctions, and alignments of stars and planets.1