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Fixed calendar

The French philosopher Auguste Comte (1798-1857) devised a fixed calendar comprising 13 months and 28 days: a new month named "sol" (for Sun) would have been intercalated in midsummer, between June and July. Comte thus came up with a year consisting of: 13 ◊ 28 = 364 days. One and one quarter days were still missing. As a result, an additional day on 29 December of each year would be called "year day" and, every four years, 29 June would be a leap day.