The Missing 23rd of the Month
Previously, I explained why the 11th of most months is mentioned far less than the other days in the Google Ngrams database of English literature from 1800-2008. This was to solve a long-standing question posed in an xkcd comic. While researching this, I encountered another mystery: the 2nd, 3rd, 22nd, and 23rd are unusually low as well—but only until the 1930s, at which point they become perfectly normal days. Last time, I set this question aside to focus on the 11th. In this installment, I explain the strange behavior of these four days.