Why does the Gregorian calendar use leap years?
A) because the tropical year is about 365.25 days long
B) because the sidereal year is longer than the tropical year
C) because Earth's axis is precessing
D) because Earth's rotation is slowing down

Question

Quizplus · Accepted Answer

The Gregorian calendar uses leap years to align with the tropical year, which is approximately 365.25 days long. Adding an extra day every four years compensates for this quarter-day discrepancy, keeping the calendar in sync with the Earth's seasons.

Why Does the Gregorian Calendar Use Leap Years