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The average is once every 7 years. Depending on the occurence of leap years, some days of the week will not have occurred as frequently until a total of 28 years has elapsed.

The day of the week that your birthday falls on changes each year because the 365 calendar days are 1 day more than an even number of weeks. So for NON LEAP YEARS, your next year's birthday will be one day later in the week. Leap years complicate things because they add another day. Birthdays after February 28 are pushed forward 2 days in the week in a Leap Year. Birthdays before February 28 are pushed forward 2 days in the year following a Leap Year. The number of years between your birthday falling on the same day will always be either 5 years, 6 years, or 11 years. (the repeated spacing being 6 years, 11 years, 6 years, 5 years).

**(see related link for any yearly calendar)**

*If you were born in a Leap Year, the exact calendar for that year will only occur every 28th year thereafter.

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12y ago

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