Why do the calendar days change each year if they have the same amount days each year excluding leap year ? Why is my birthday a different day each year?
by 
Bunnie9911
ANSWERS: 3
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Why? Because 365 isn't evenly divisible by seven. When you divide, you get 52 with one left over. So, the calendar "moves" one day each year, and two days in leap years, measured against the days of the week.
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If you are talking about the day of the week, and not taking leap years into accounts, the calendar would repeat if January 1st fell always on the same weekday. But a normal year has 52 weeks and one day, so if you start the year on a Monday (as it was the case in 2007), the last day of the year is also a Monday. Because of this, the following year starts on a Tuesday. Generally speaking, every year starts on the next week day than the former, except is the former is a leap year: in this case, the year starts two week days later.
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It's because people stubbornly refuse to use a more efficient calendar because it requires a few un-days to make it come out even.
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