Question: why is 12pm called noon?
Answer: Originally Answered: Why do we call 12 p.m. noon? The term 'noon' comes from the Old English 'non', which in turn is derived from the Latin 'nona hora' -ninth hour. Originally it referred to the ninth hour after sunrise - that is, 3pm. During the twelfth century, the meaning began to shift from 3pm to midday.