Over time, the coming of spring in Rome no longer coincides with the celebration of Easter Day because of the differences in these calculations. So, Pope Gregory XVIII in his leadership improved the Julian calendar by launching the Gregorian calendar system which was still based on Christian calculations and the names of the same month. Aloysius Lilius, an astronomer and doctor from Ciro who is currently part of Italy has sent a dating proposal. After he died, his work was continued and refined by mathematician and astronomer Christopher Clavius from Germany.
The results later became the basis of the Gregorian calendar reform from 1528, as explained by August Ziggler SJ in The Papal Bull of 1582 Promulgating A Reform of The Calendar. The Papal Bull or Inter Gravissimas which contained the edict was officially issued on February 24, 1582. The Pope ordered Catholic clergy as well as all the highest ranks of the Catholic Church to adopt the new calendar system. Matt Rosenberg’s report on the Geography About website states that the news of this calendar change is being disseminated throughout mainland Europe. But only a few countries were ready and willing to change the new calendar in 1582, namely Italy, Luxembourg, Portugal, Spain, and France.
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