C. THE ROMAN CALENDAR
All primitive calendars went by the moon. Moon and month are the same word in English. No more than Hengist and Horsa could the early Romans have conceived of a month not beginning with the day of the new moon, as all months begin yet in the Jewish and Mohammedan calendars.
The first day of each month the Romans called its Kalends (announcement day). After that day they called each day so many before the Nones (half moon), then so many before the Ides (full moon), then so many to the Kalends of the next month. Julius Caesar, impatient with the difficulties of fitting together the solar and lunar calendars, bade his experts ignore the moon and divide the solar year into twelve months. They did, and his calendar, with trifling improvements, has lasted till our days. The Romans continued to reckon days before the Nones, Ides and Kalends. The Nones fell on the seventh of March, May, July and October, on the fifth of the other months; the Ides on the fifteenth of March, May, July and October and on the thirteenth of the rest.