Read the passage.
Leap Year
In ancient Rome, Julius Caesar established the 365 day calendar to match the changing seasons created by the earth's movement around the sun. Caesar recognized a problem, though: the earth actually takes 365 1/4 days to circle the sun. The extra 1/4 day would gradually shift the calendar away from the seasons. Caesar's solution was to add an extra day every four years in what are now called leap years. Caesar's math wasn't quite right, though. His approach added too many days. So, in 1582, Pope Gregory XIII improved on Caesar's work. He proposed that century years should not be leap years unless they can be evenly divided by 400. Thus, 1600 would be a leap year, while 1700 would not. Pope Gregory's calendar, called the Gregorian calendar, is still in use today.
What is the main, or central, idea of the passage?
(1 point)
Responses
The leap year was created in ancient Rome to keep the calendar aligned with the earth's movements and was later modified by Pope Gregory XIII.
The leap year was created in ancient Rome to keep the calendar aligned with the earth's movements and was later modified by Pope Gregory XIII.
Julius Caesar created the leap year by adding an extra day to the 365 day calendar once every four years.
Julius Caesar created the leap year by adding an extra day to the 365 day calendar once every four years.
Pope Gregory XIII improved the calendar by making century leap years only if they could be divided by 400.