To fix this, we had to tweak the calendar to have the same number of days as the orbit. Somehow, we needed to break away from having the same number of days every year, but without having a fraction of a day; people get upset if you restart the day at a time other than midnight. We needed to link a year to the Earth’s orbit without breaking the tie between a day and the Earth’s rotation. The solution that most civilizations came up with was to vary the number of days in any given year so there is a fractional number of days per year on average.
