MCQ Detailed View

The Earth moves around the Sun in a fixed path called an orbit. The time it takes to complete one full orbit is known as a revolution, and this period is about 365.25 days. This duration defines one year in our calendar.

The extra 0.25 days (a quarter of a day) each year may seem small, but over four years it adds up to one whole day. To keep our calendar aligned with the Earth’s revolution, we add one extra day in February every four years. This special year is called a leap year and has 366 days instead of 365.

The Earth’s orbit is not a perfect circle but an elliptical path, which means the distance between the Earth and the Sun changes slightly during the year. This, combined with the tilt of Earth’s axis, is what causes the seasons — summer, winter, spring, and autumn. When the Northern Hemisphere tilts toward the Sun, it experiences summer, while the Southern Hemisphere experiences winter, and vice versa.

It is also important to understand the difference between rotation and revolution. The rotation of Earth means spinning on its axis, which takes about 24 hours and gives us day and night. The revolution of Earth around the Sun is much longer and defines the yearly cycle that we measure as 365.25 days.

This concept is central to astronomy and everyday science because it explains the natural rhythm of timekeeping, the calendar system, and the sequence of seasons. Without understanding Earth’s revolution, we could not organize time properly or predict seasonal changes.

Therefore, the correct answer is 365.25 days, which is the scientifically measured time Earth takes to revolve around the Sun once.