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

Question

Quizplus · Accepted Answer

The Julian calendar introduced the concept of a leap year, where every fourth year had an extra day, to account for the fact that the Earth's orbit around the Sun is slightly longer than 365 days. This was a significant advance in the way the length of the year was calculated and helped to keep the calendar in sync with the seasons.

The Julian Calendar Made the Significant Advance Of