Q:

# How long does it take the Earth to make one revolution?

A:

Earth completes one revolution around the Sun for every 365.242199 times it rotates on its axis. This figure is, unfortunately, not evenly divisible, which has historically caused difficulties for the creators of various calendars.

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Credit: Chris Walsh The Image Bank Getty Images

A 360-day year would permit the use of a simple calendar of 12 30-day months. The extra five days require that a 12-month calendar have months of differing lengths. Even then, the unaccounted-for remainder of approximately .25 days forced the inclusion of quadrennial leap days in the Julian calendar. Even adding a leap day failed to stabilize the calendar because the remainder was actually slightly less than .25 days. This was addressed by the Gregorian calendar, which omits leap days in centenary years unless the date is divisible by both 4 and 400.

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## Related Questions

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Venus completes an orbit around the Sun in 224.7 days, compared to Earth's 365.25 days. Because Venus is closer to the Sun than Earth, Venus orbits the Sun faster.

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Mars revolves around the Sun once every 687 Earth days, or 1.88 Earth years. It revolves around the Sun at an average distance of 142 million miles, about 50 million miles farther out than the orbit of Earth.

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Mars completes one revolution on its axis in 24.6 hours. It takes 1.88 Earth years for Mars to make one revolution around the sun. Mars is over 140 million miles from the sun.