one tough cookie

Friday - - Mind Games -

Ques­tion An ex­tra day is added in a leap year be­cause it takes the Earth about 365¼ days to re­volve around the sun, so a day adds on ev­ery four years. But this proved to be an over cal­cu­la­tion. What cor­rec­tive mea­sure was thus ap­plied to cen­ten­nial years, i.e. years end­ing in -00?

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