In Counter-Reformation, how is the Calendrical studies of the Outcomes elucidated?

More celebrations of holidays and similar events raised a need to have these events followed closely throughout the dioceses. But there was a problem with the accuracy of the calendar: by the sixteenth century the Julian calendar was almost ten days out of step with the seasons and the heavenly bodies. Among the astronomers who were asked to work on the problem of how the calendar could be reformed was Nicolaus Copernicus, a canon at Frombork (Frauenburg). In the dedication to De revolutionibus orbium coelestium (1543), Copernicus mentioned the reform of the calendar proposed by the Fifth Council of the Lateran (1512–1517). As he explains, a proper measurement of the length of the year was a necessary foundation to calendar reform. By implication, his work replacing the Ptolemaic system with a heliocentric model was prompted in part by the need for calendar reform.
An actual new calendar had to wait until the Gregorian calendar in 1582. At the time of its publication, De revolutionibus passed with relatively little comment: little more than a mathematical convenience that simplified astronomical references for a more accurate calendar. Physical evidence suggesting Copernicus's theory regarding the earth's motion was literally true promoted the apparent heresy against the religious thought of the time. As a result, during the Galileo affair, Galileo Galilei was placed under house arrest, served in Rome, Siena, Arcetri, and Florence, for publishing writings said to be "vehemently suspected of being heretical." His opponents condemned heliocentric theory and temporarily banned its teaching in 1633. Similarly, the Academia Secretorum Naturae in Naples had been shut down in 1578. As a result of clerical opposition, heliocentricists emigrated from Catholic to Protestant areas, some forming the Melanchthon Circle.
Nicolaus Copernicus calendar Frombork Arcetri Galileo affair Melanchthon Circle Ptolemaic system Catholic reform Siena Fifth Council of the Lateran Florence Academia Secretorum Naturae Galileo Galilei Gregorian calendar Protestant Rome Julian calendar heliocentric model De revolutionibus orbium coelestium