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A half-birthday is a day approximately six months before or after the anniversary of a person's birth. It is sometimes marked by people whose birthday either falls on major holidays, near major holidays, or both, the celebration of which may overshadow celebration of the birthday. [1] It may also be marked by students whose birthday does not ...
An unbirthday (originally written un-birthday) is an event celebrated on all days of the year which are not a person's birthday. It is a neologism which first appeared in Lewis Carroll's 1871 novel Through the Looking-Glass.[1][2] The concept gave rise to "The Unbirthday Song" in the 1951 animated feature film Alice in Wonderland.
In probability theory, the birthday problem asks for the probability that, in a set of n randomly chosen people, at least two will share a birthday. The birthday paradox refers to the counterintuitive fact that only 23 people are needed for that probability to exceed 50%. The birthday paradox is a veridical paradox: it seems wrong at first ...
Hebrew birthday. A Hebrew birthday (also known as a Jewish birthday) is the date on which a person is born according to the Hebrew calendar. This is important for Jews, particularly when calculating the correct date for day of birth, day of death, a bar mitzva or a bat mitzva. This is because the Jewish calendar differs from the secular and ...
Life table. In actuarial science and demography, a life table (also called a mortality table or actuarial table) is a table which shows, for each age, the probability that a person of that age will die before their next birthday ("probability of death "). In other words, it represents the survivorship of people from a certain population. [1]
For example, if a birthday is May 15 (135th day of the year), the half-birthday is November 14 (day 317.625, rounded to day 318)." If this is included, someone may attempt to figure out their half-birthday using these instructions.
In common years, they celebrate their birthdays on 28 February or 1 March. Technically, a leapling will have fewer birthday anniversaries than their age in years. This phenomenon may be exploited for dramatic effect when a person is declared to be only a quarter of their actual age, by counting their leap-year birthday anniversaries only.
The birthday effect (sometimes called the birthday blues, especially when referring specifically to suicide) is a statistical phenomenon where an individual's likelihood of death appears to increase on or close to their birthday. The birthday effect has been seen in studies of general populations in England and Wales, [1] Switzerland, [2][3] Ukraine, [4] and the United States, [5][6] as well ...