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What was the crisis with the calendar that Copernicus solved?

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A recent blog post on Yovisto repeats a very widespread myth concerning Copernicus, his De revolutionibus and the calendar reform of 1582. ... read more

The church's civil calendar's year was about 11 minutes shorter than the tropical year, which is set to the equinoxes and thus seasons. This discrepancy adds up to about 1 day every 130 years. Since Easter is defined by the tropical calendar and Christmas by the civil, Easter would eventually come to pre-date Christmas. read more

Comets in the Copernican Revolution 315 optical theory, Tycho Brahe concluded that the source of the light in this case was the planet Venus rather than the Sun," Kepler, who was the beneficiary of much of Tycho Brahe's observational work, also adopted the theory that comets were spherical lenses early in his career. read more

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