Introduction
We all use a calendar to keep track of the date, and it let's us know how much time has passed since something happened. Our calendar length measures one year, which has 12 months and 52 weeks. But have you ever wondered why our calendar is set up the way it is? Have you ever wondered why we are only in the year 2017 even though humans have been around for tens of thousands of years? Also, were the calendars that existed before the one we use today?