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Doomsday rule
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===Example 2 (other centuries)=== Suppose that we want to find the day of week that the [[American Civil War]] broke out at [[Fort Sumter]], which was April 12, 1861. The anchor day for the century was 94 days after Tuesday, or, in other words, Friday (calculated as {{math|18 Γ 5 + β{{sfrac|18|4}}β}}; or just look at the chart, above, which lists the century's anchor days). The digits 61 gave a displacement of six days so doomsday was Thursday. Therefore, April 4 was Thursday so April 12, eight days later, was a Friday.
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