Do you have friends or acquaintances who were born on the same date? This phenomenon can be explained by the ‘Birthday Paradox’, which explains about 50% probability of having a birthday in a group of 23 people. Both are born on the same day.
There is a pattern to births beyond astrological beliefs, although a year has 365 days, some months have a higher birthrate than others.
(Keep reading: Woman celebrates 50th birthday as a quinceañera, video goes viral.)
According to statistics compiled in UN-recognized countries, the day the most people were born, September 9. It should be said that the ninth month of the year also takes the second and third places in the list. 12 and 19 days respectively.
These dates are more common because conception can occur in December, in the middle of the Christmas celebration, with cold climates and holidays also creating a favorable environment.
(Also: Tragic birthday! He gets pushed into the cake and gets a toothpick stuck in his eye.)
Supporting this theory, a study from Harvard University estimates that the most common birthday in the world is September 16. To perform the sample, they took data from 1973 to 1999.
The least popular dates to be born are estimated to be both December 24, which is Christmas Eve, and December 31, which is New Year’s Eve. Experts suggest that the birth rate dropped just over 15% in those two days.
The least common date for births is February 29, as this only happens in leap years.
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Source: Exame