Because the Earth does not orbit around the sun exactly, the calendar compensates. Further compensation is made during a Leap Year which offsets the difference between the solar year of 365.24 days and the calendar year of 365 days
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by the way its ""which"" not witch .. every four years only the month of Feburary has 28 days........
feburary
there are 4 weeks in the month of feburary as it has 28 days but in leap year it has 29 days and 5th week also
They all do because its saying how many months have 28 days not what months only have 28 days
February has only 28 days. Every four years, it has twenty nine. This is known as a "leap" year.