The Julian Calendar Made the Significant Advance Of

Multiple Choice

The Julian calendar made the significant advance of:

A) using the Moon's motion to simplify the way the length of the year was calculated
B) dropping 12 days from the year that was in use before it
C) defining time zones for the first time in the history of the world
D) introducing the leap year, so that every fourth year had an extra day
E) allowing everyone to sleep late on Saturdays