Question

How many days does the earth take to complete one revolution?

Answer 1

Hint: Revolution of the earth is the distance of the earth to complete the whole round of its orbit along the sun and we find the time it takes to complete one such revolution. The time period to complete one revolution of the earth is approximately one year of earth but not exactly one year, so calculate the approximate number of days in a year.

Complete answer:
 It takes earth approximately 365.25 days to complete one revolution around the earth. Thus earth takes one year to complete one revolution around the sun. One day is approximately 23 hours and 56 minutes and thus it takes 365 times one day to complete a revolution.

Additional information:
None of the planets orbit around the Sun. In reality, the Sun and all of the planets in the solar system orbit around the centre of mass of the solar system. This centre of mass is actually constantly moving and usually above the Sun's surface. It is above the Sun’s surface because most of the mass of the Solar system is concentrated near the Sun.

The difference in the year lengths of the different years such as for sidereal year or verbal equinox is due to the fact that the earth's orbit is constantly changing due to the precession and the gravitational pull of the other planets.

Note: In general, we actually take one complete revolution as 365 days but this is not actually true. The earth takes 365.25 days and to compensate for this, we have a leap year. For every four years, we take one year such that it has 366 days instead of 365 days. Thus a leap year is repeated after four years to compensate between 365 and 365.25 days.