Leap years- years that contain an extra day-are necessary because
A) Earth's speed of revolution along its elliptical orbit varies throughout the year.
B) 365 days is not exactly divisible by four.
C) the rotation rate of Earth varies, leading to days of different length during the year.
D) the length of a year is not an exact number of days.

Question

Quizplus · Accepted Answer

Leap years are necessary because the Earth takes approximately 365.25 days to complete one orbit around the Sun, not an exact 365 days. This extra quarter of a day accumulates, and to correct this discrepancy and keep our calendar in alignment with Earth's position in its orbit, an extra day is added every four years.

Leap Years- Years That Contain an Extra Day-Are Necessary Because