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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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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.

## Related Questions

• A:

The Earth spinning on its axis is called its rotation. The time it takes for the planet to complete one spin is its rotation period. For Earth, this period of time is approximately 24 hours, or one Earth day.

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• A:

The Earth moves around the Sun due to gravitational pull exerted upon the Earth from the Sun. Stars and planets all have magnetic fields that attract smaller objects, such as satellites. Objects are attracted to the strongest gravitational pull that is in close proximity.

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• A:

Earth revolves around the Sun at a speed of 107,300 kilometers per hour. The distance of the Sun from Earth is 93 million miles, or 149, 597,890 kilometers. It takes 365 days and six hours to complete one revolution around the Sun.