Gregory* XIII ordered the Julian* calendar revised. The revision (also called New Style) reckoned October 5, 1582, as October 15 and c. yrs. as leap yrs. only when divisible by 400. It followed the system developed by Aloysius Lilius (or Luigi Lilio Ghiraldi), astronomer and physician of Naples, and verified and completed by Christopher Clavius (15371612), Bavarian Jesuit astronomer and mathematician. See also Easter Dates.
Edited by: Erwin L. Lueker, Luther Poellot, Paul Jackson
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