The reason why there are not exactly 365 days in a year is because it takes approximately 365.25 days for Earth to orbit the Sun - a solar year. 
We usually round the days in a calendar year to 365. To make up for the missing partial day, we add one day to our calendar approximately every four years.
This is called a leap year and it has 366 days instead of 365. 
The length of the day and year are not exact multiples; they don’t divide evenly. That extra fraction is critical; it adds up.
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