Nature 35, 517-517 (31 March 1887) | doi:10.1038/035517a0

To Find the Day of the Week for any Given Date

LEWIS CARROLL

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HAVING hit upon the following method of mentally computing the day of the week for any given date, I send it you in the hope that it may interest some of your readers. I am not a rapid computer myself, and as I find my average time for doing any such question is about 20 seconds, I have little doubt that a rapid computer would not need 15.