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How many Days are in a Year?

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A year is a name given to the span of time that the earth takes to complete one full round around the sun throughout the course of its orbit. An approximation of the number of days that make up the Earth's orbital period may be found in a calendar year. On the other hand, there are several variations of calendars, each of which provides a slightly different estimate of the total number of days in a year. The Gregorian calendar year, the Julian year, the Sidereal year, and the tropical year are some examples of this.

Calculating the number of days in a year  

the year according to the Gregorian calendar

One year according to the common calendar has 365 days:


1 standard year is equal to 365 days.


One leap year on the calendar consists of 366 days:


1 leap year = 366 days


Every fourth year there is an extra day added to the calendar in the form of a leap year, with the exception of years that are divisible by 100 but not by 400.


Therefore, the following is the average duration of a year according to the Gregorian calendar:


1 mean year = (365+1/4-1/100+1/400) days = 365.2425 days