Step 1 : Introduction to the question "When is the "Ides of March?""
...The early Roman calendar had ten months, beginning with Martius, or March. The dates on this calendar related to the lunar phases of the month. There were three markers for the moon's phases: Kalends, or Kal, Nones, or Non, and Ides, or Id. The first of the month saw the new moon (Kalends) in control. Around the 5th or 7th of the month, the first quarter moon (Nones) appeared. The Ides of March came around the 13th or 15th of March. The Ides ushered in the full moon, which was the first full moon of the new year. Source: History.com
