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A New Calendar
As Catholic missionaries arrived in China, bringing with them new ideas such as eclipse predictions. The missionaries corresponded Chinese discoveries back to Europe, adding new astrological concepts to their own interpretations.

With these culmination of new ideas, even the Catholic Church decided to approve of a new calendar with astrological influence in mind. Scientist Paul of Middelburg, who had been hired by the Church, had not yet figured out how to create a new successful calendar for them. However, a respondent to Paul, named Nicolaus Copernicus, showed promise with new astrological research. Copernicus published these discoveries in De revolutionibus. The section “On the Magnitude and Difference of the Solar Year” presents a system with two distinct years, one of which being the familiar “star” year, the time it takes for the earth to revolve around the sun, and the slower tropical year, which is based on the time from one summer solstice to the next.