Leap years occur because:
A) Earth's orbital period around the Sun is decreasing.
B) Earth's orbital period is 365.24 days.
C) the Gregorian calendar contains only 11 months.
D) Earth speeds up in its orbit when it comes closest to the Sun.

Question

Quizplus · Accepted Answer

Earth's orbital period is not exactly 365 days, but actually 365.24 days. To account for this extra time, leap years were introduced where an extra day (February 29th) is added every four years. This keeps the calendar year in sync with Earth's rotation around the Sun.

Leap Years Occur Because