A red-letter day is a day of special significance for some reason or another. Why do we call it a red-letter day?
Red-Letter Day
A red-letter day is a day of special significance for some reason or another. Why do we call it a red-letter day?
You’re probably familiar with these abbreviations, used to indicate if a year took place either on or after AD 1, or before it. You probably also know that BC stands for Before Christ, as our current calendar system is based on the assumption that Jesus Christ was born in AD 1. What about AD though?