Gregorian reform of 1582
About the Gregorian reform of 1582
Pope Gregory XIII's bull Inter gravissimas, dated 24 February 1582, ordered that Thursday 4 October 1582 be followed by Friday 15 October. The reform, based on proposals by Aloysius Lilius and defended by Christopher Clavius, restored the March equinox to around 21 March, where it stood at the Council of Nicaea in 325, to keep Easter correct. Spain, Portugal, the Italian states and Poland-Lithuania switched at once and France followed in December 1582.
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