The Phase of the Day: Something else the Gregorian Calendar Gets Right

In the last calendars post, we concluded that days and years were the proper periods for a calendar . But their underlying natural phenomena are cycles without beginning and without end. To be useful in a calendar, we need to be able to put particular events on particular days and years. We need to be able to count and label days and years. To do that, we need to pick a dividing line between one…