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| | Units of Time Part III: The Year |
 | | His main advisors were Aloysius Lilius, who died early in the reform process but whose plan was represented by his brother Antonio, and Christopher Clavius, who expanded Lilius' plans into an 800 page volume. |
 | | In addition to modifying the average length of the year, thus stabilizing the date of the vernal equinox, the key feature of the Lilius/Clavius plan was a scheme to settle the date of Easter in a manner that was irrefutably superior. |
 | | Despite their best efforts, Lilius and Clavius were unable to do so perfectly, and Easter and Passover coincide from time to time (most recently in 1981, with the next occurrence in 2123). |
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